Keen on badminton, in part (4)

I believe the answer is:

into

'keen on' is the definition.
(I've seen this before)

'badminton in part' is the wordplay.
'in part' says the answer is hidden in the clue.
'INTO' is hidden within 'badminton'.

(Other definitions for into that I've seen before include "Four this twelve is three" , "Knowledgeable about" , "A fan of" , "Fascinated by" , "Liking" .)

I've seen this clue in The Telegraph and The Sun.

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