Press being offensive (4)
I believe the answer is:
push
I believe this clue is a double definition.
'press' is the first definition.
(pushing is a kind of pressing)
'offensive' is the second definition.
(I've seen this before)
'being' acts as a link.
(Other definitions for push that I've seen before include "Offensive - press" , "Strongly promote" , "Try to sell" , "Opposite of pull" , "Thrust" .)