And what is more, some profit (5)

I believe the answer is:

again

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'and what is more' is the definition.
I can't tell whether this defines the answer.

'some profit' is the wordplay.
'some' becomes 'a'.
'profit' becomes 'gain' (synonyms).
'a'+'gain'='AGAIN'

Can you help me to learn more?

(Other definitions for again that I've seen before include "Not for the first time" , "Anew" , "Furthermore" , "'Another time, once more (5)'" , "On the other hand" .)

I've seen this clue in The Globe and Mail.

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