Crossword Genius

Not for the first time, an increase (5)

Ross

I believe the answer is:

again

'not for the first time' is the definition.
(another time)

'an increase' is the wordplay.
'an' becomes 'a'.
'increase' becomes 'gain' (gain is a kind of increase).
'a'+'gain'='AGAIN'

(Other definitions for again that I've seen before include "On the other hand" , "Here we go ___" , "'Another time, once more (5)'" , "repeat order" , "return" .)

I've seen this clue in the Evening Standard.
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