Crossword Genius

Comment on stain (6)

Ross

I believe the answer is:

remark

'comment' is the definition.
(a remark is a spoken comment)

'on stain' is the wordplay.
'on' becomes 're' ('on' can be mean 'with reference to').
'stain' becomes 'mark' (synonyms).
're'+'mark'='REMARK'

(Other definitions for remark that I've seen before include "Observation - notice" , "Written or spoken comment" , "Incidental observation" , "Something said; take notice of" , "Comment, observation" .)

I've seen this clue in The Telegraph.
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