In favour of (3)

I think it could be either:

for

pro

'in favour of' is the definition.
(being for a particular cause)

This is all the clue.

(Other definitions for for that I've seen before include "In support of" , "On the side of" , "Approving" , "Pro" , "See 24" .)

I've seen this clue in The Telegraph, the Evening Standard, The Independent, The Times, The Mirror, The Daily Mail and The Sun.

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