Distort shared lines for aggressive marketing (4,4)
I believe the answer is:
hard sell
'aggressive marketing' is the definition.
(I've seen this in another clue)
'distort shared lines' is the wordplay.
'distort' indicates anagramming the letters (I've seen 'distorted' mean this).
'lines' becomes 'll' (an abbreviation for line written twice).
'shared' with letters rearranged gives 'hardse'.
'hardse'+'ll'='HARD SELL'
'for' is the link.
(Other definitions for hard sell that I've seen before include "aggressive policy?" , "Serious persuasion" , "Determined flogging" , "Tactic of aggressive promotion" , "manipulative advertising" .)