Mostly flog salmon, perhaps being greedy (7)
I believe the answer is:
selfish
'greedy' is the definition.
(thesaurus)
'mostly flog salmon perhaps' is the wordplay.
'mostly' means to remove the last letter.
'flog' becomes 'sell' (I've seen this before).
'salmon perhaps' becomes 'fish' (salmon is a kind of fish).
'sell' with its last letter taken off is 'sel'.
'sel'+'fish'='SELFISH'
'being' acts as a link.
(Other definitions for selfish that I've seen before include "without consideration" , "inconsiderate" , "Mercenary" , "Egocentric - greedy" , "for personal gain" .)