Be unwell (3)

I believe the answer is:

ail

'be unwell' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for ail that I've seen before include "Be in poor health" , "Be unwell, suffer" , "Trouble, afflict; be sickly" , "Worry" , "pain" .)

I've seen this clue in The Sun, the Universal, the LA Times, the King Feature Syndicate, the USA Today, The Star Tribune, the Penny Press and The Guardian.

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