Once more on account of a profit (4,5)

I believe the answer is:

over again

'once more' is the definition.
(synonyms)

'on account of a profit' is the wordplay.
'on account of' becomes 'over' (over can mean on account of or as a result of).
'profit' becomes 'gain' (synonyms).
'over'+'a'+'gain'='OVER AGAIN'

(Another definition for over again that I've seen is " Once more".)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.