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18d "One involved in Middle Common Room furore about LSD tablet" (8)

?I?R?D?T am assuming it's MICRODOT but is that really another word for an LSD tablet?

Any help from the ex drug-taking community appreciated

It is

microdot

noun
1.
a microphotograph, especially of a document, that is only about 1 mm across.
2.
a tablet of LSD.

It is - I speak as a member of the Chambers reading community, NOT the drug takers! It's defined as a 'small pill containing concentrated LSD'.

Thanks to you both; note to self to get a proper dictionary