It may be buttonholed or rebuked (6)

I believe the answer is:

orchid

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'it may be buttonholed' is the definition.
The definition suggests a singular noun which matches the answer.

'or rebuked' is the wordplay.
'rebuked' becomes 'chid' ('chide' can be a synonym of 'rebuke').
'or'+'chid'='ORCHID'

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(Other definitions for orchid that I've seen before include "Plant with showy flowers" , "Ornate flower" , "Plant with showy flower" , "Much sought-after family of plants" , "Tropical flowering plant" .)

I've seen this clue in The Globe and Mail, The Telegraph and The Guardian.

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