Such a clue could be thin (4)

I believe the answer is:

hint

'such a clue' is the definition.
(synonyms)

'could be thin' is the wordplay.
'could be' indicates an anagram.
'thin' anagrammed gives 'HINT'.

(Other definitions for hint that I've seen before include "Thin sort of slight indication" , "signal" , "CRT screen coating" , "Intimate" , "Tip-off" .)

I've seen this clue in The Irish Independent.

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