Drink with iron -- squash? (8)
I believe the answer is:
suppress
'squash?' is the definition.
(I've seen this before)
'drink with iron' is the wordplay.
'drink' becomes 'sup' (to sup is to drink).
'with' is a charade indicator (letters next to each other).
'iron' becomes 'press' (I've seen this before).
'sup'+'press'='SUPPRESS'
(Other definitions for suppress that I've seen before include "Stop publication of" , "Prevent from being made public" , "Prevent the dissemination of, information say" , "'Crush, keep down (8)'" , "Keep down, hold back" .)