Crowd in rear of brasserie getting very good coffee (8)
I believe the answer is:
espresso
'coffee' is the definition.
(I know that espresso is a type of coffee)
'crowd in rear of brasserie getting very good' is the wordplay.
'crowd' becomes 'press' (to press can mean to crowd around).
'in' indicates putting letters inside.
'rear of' indicates one should take the final letters.
'getting' is a charade indicator (letters next to each other).
'very good' becomes 'so' (as in the adjectival form 'just so!').
The last letter of 'brasserie' is 'e'.
'e'+'so'='eso'
'press' placed within 'eso' is 'ESPRESSO'.
(Other definitions for espresso that I've seen before include "Steamed coffee" , "Coffee made by forcing steam through grounds" , "that's stimulating" , "Italian-style coffee" , "This may keep someone awake!" .)