On top, a win follows (5)

I believe the answer is:

again

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'on top a win follows' is the definition.
I can't tell whether this defines the answer.

'a win follows' is the wordplay.
'win' becomes 'gain' (synonyms).
'follows' says to put letters next to each other.
'a'+'gain'='AGAIN'

Can you help me to learn more?

(Other definitions for again that I've seen before include "Predictably perhaps" , "Here we go ___" , "return" , "On the other hand" , "second term" .)

I've seen this clue in The Independent.

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