Crossword Genius

Possibly bitter about China supporter (10)

Ross

I believe the answer is:

befriender

'supporter' is the definition.
(a friend)

'possibly bitter about china' is the wordplay.
'possibly bitter' becomes 'beer' (bitter is a type of beer).
'about' indicates putting letters inside.
'china' becomes 'friend' (cockney rhyming slang, mate is china plate).
'beer' enclosing 'friend' is 'BEFRIENDER'.

I've seen this clue in The Times.
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