Proceeds with instruction to enter after part exchange (6)
I believe the answer is:
income
'proceeds' is the definition.
(thesaurus)
'instruction to enter after part exchange' is the wordplay.
I cannot really see how this works, but
'part' could be 'in' (synonyms) and 'in' is found within the answer.
The remaining letters 'come' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'with' acts as a link.
(Other definitions for income that I've seen before include "Coin me! (anag)" , "Returns" , "Earned or unearned revenue." , "Money gained over time" , "Money earned" .)