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Thank you, Baldric and others. 'Blow the Gaff' fits nicely, but it upsets another difficult clue, in one letter
The clue is "plant displaying seasonal colour" (11) for which I had tentatively entered: APOCYNACEAE. If Blow the Gaff is correct (and I think it is), then this other clue should now begin with W. Only the two E at the end of the word are safely anchored. Any ideas on this latter problem?