Beer reportedly makes you sicken (3)
I believe the answer is:
ail
'sicken' is the definition.
(I've seen this before)
'beer reportedly' is the wordplay.
'beer' becomes 'ale' (I've seen this before).
'reportedly' indicates a 'sounds like' (homophone) clue.
'ale' sounds like 'AIL'.
'makes you' is the link.
(Other definitions for ail that I've seen before include "Worry" , "Bother" , "Be the worse for wear" , "Become unwell" , "Afflict -- feel unwell" .)