Gangster invites in composer briefly for a drink (10)
I believe the answer is:
cappuccino
'drink' is the definition.
(I've seen this before)
'gangster invites in composer briefly for a' is the wordplay.
I cannot quite understand how this works, but
'in' is present in the answer.
'a' is present in the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for cappuccino that I've seen before include "Drink" , "Type of coffee" , "Frothy coffee" .)