Share with journalist (5)
I believe the answer is:
whack
'share' is the definition.
(whack can mean a share or contribution)
'with journalist' is the wordplay.
'with' becomes 'w' (abbreviation).
'journalist' becomes 'hack' (I've seen this before).
'w'+'hack'='WHACK'
(Other definitions for whack that I've seen before include "Punch" , "Hard hit" , "Strike hard" , "Strike; specified share" , "Onomatopoeic blow" .)