https://www.freerepublic.com/~Swordmaker/
CLAS, CLAS-1, -2, 3-9: (#365, #436, #466, #500, #520, #568, #570, #575, #772, #836, #1010, #1187, #1190, #1241, #1254, #1307, #1441, #1474) CLAS has several possible referents
Closest relevant acronym listed from British intelligence The CESG Listed Adviser Scheme was a program run by CESG, to provide a pool of information assurance consultants to government departments and other public-sector bodies in the UK. CLAS consultants advised on systems that handle protectively marked information, up to and including SECRET; for instance, they may have advised on GSI accreditation. CLAS consultants held a security clearance.
CLAS consultants developed risk assessments, and risk management and accreditation document sets (RMADS). CLAS was supposedly closed in January 2016. Q hints that Steele was one of these consultants paid by CLAS, perhaps Podesta too.
See CESG.
The National Standards for Culturally and Linguistically Appropriate Services in Health and Health Care (The National CLAS Standards) aim to improve health care quality and advance health equity by establishing a framework for organizations to serve the nations increasingly diverse communities. (Thanks to FreeQ Bigg Red).
However, the most likely meaning for Q is CLASSIFIED: The word CLAS in the context of classified was used by Q in the following Q Drops as compiled by FreeQ TexOkie: #2, #14, #29, #30, #31, #35, #45, #71, #77, #85, #90, #92, #117, #128, #179, #220*, #236, #373, #392, #460, #668, #714, #772, #775. #805**, #1001, #1306, #1328, #1339, #1433, #1496, #1510, #1549, #1559, #1563, #1638, #1673. It is probable the number following CLAS (CLAS-1, CLAS-2, etc.) indicates the degree of classification that has been applied.
* In Q Drop #220 the word in the drop is unclassified
** In Q Drop #805 the word is declassified. Classified National Security Information, Executive Order # 13526).
thanks!