Staunch (4)

I think it could be either:

avid

stem

'staunch' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for stem that I've seen before include "Main stalk of a plant" , "Block" , "Flower's stick" , "Hold back - stock - check" , "Slender upright part, of flower or wineglass" .)

I've seen this clue in the Evening Standard, The Telegraph, The Independent and The Guardian.

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