Become keen on act (4,4)
I believe the answer is:
turn into
'become' is the definition.
('turn into' can be a synonym of 'become')
'keen on act' is the wordplay.
'keen' becomes 'into'.
'on' says to put letters next to each other.
'act' becomes 'turn' (theatre**).
'into' after 'turn' is 'TURN INTO'.
(Another definition for turn into that I've seen is " Become".)
I've seen this clue in The Independent.
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