Feel sick if beer is spoken of? (3)
I believe the answer is:
ail
'feel sick' is the definition.
(I've seen this in another clue)
'beer is spoken of?' is the wordplay.
'beer' becomes 'ale' (type of beer).
'is spoken of?' indicates a 'sounds like' (homophone) clue.
'ale' sounds like 'AIL'.
'if' acts as a link.
(Other definitions for ail that I've seen before include "distress" , "Worry" , "Sicken" , "Sink" , "Bother" .)