Hit communist conceals pain (7)
I believe the answer is:
reached
'hit' is the definition.
(hit can mean to reach or arrive somewhere)
'communist conceals pain' is the wordplay.
'communist' becomes 'red' (red can informally mean communist).
'conceals' indicates putting letters inside.
'pain' becomes 'ache' (ache is a kind of pain).
'red' going around 'ache' is 'REACHED'.
(Other definitions for reached that I've seen before include "Attained" , "Came to (a place)" , "Stretched or arrived" , "Cad here (anag.)" .)