Rue (6)

I believe the answer is:

regret

'rue' is the definition.
(synonyms)

This is all the clue.

(Other definitions for regret that I've seen before include "Sorrow for something done" , "Rue, repent" , "Feel remorse for" , "Subsidiary theorem" , "Compunction" .)

I've seen this clue in the LA Times, the USA Today, The Irish Times, the Evening Standard, the Sydney Morning Herald, The Telegraph, The Mirror and the Penny Press.

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