Be a frequent contributor to rally previously? (10)

I believe the answer is:

beforehand

'previously?' is the definition.
(I've seen this before)

'be a frequent contributor to rally' is the wordplay.
'a frequent contributor to rally' becomes 'forehand' (type of tennis stroke forming part of rally).
'be'+'forehand'='BEFOREHAND'

(Other definitions for beforehand that I've seen before include "Previously" , "In advance" , "Earlier" .)

I've seen this clue in The Times.

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