Slight, subtle hint (4)

I believe the answer is:

thin

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'slight' is the definition.
(similar in meaning)

'subtle hint' is the wordplay.
'hint' anagrams to 'THIN'.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for thin that I've seen before include "Sparse; not dense" , "Measure" , "Carrying little fat" , "Unconvincing" , "Lean; make (plants) less crowded" .)

I've seen this clue in the Evening Standard.

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