Slender sort of hint (4)

I believe the answer is:

thin

'slender' is the definition.
(synonyms)

'sort of hint' is the wordplay.
'sort of' is an anagram indicator.
'hint' anagrammed gives 'THIN'.

(Other definitions for thin that I've seen before include "(Of smile) weak, forced" , "Insubstantial" , "Carrying little fat" , "Slender, narrow" , "Lacking substance; not dense" .)

I've seen this clue in The Mirror.

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