Slight, subtle hint (4)

I believe the answer is:

thin

I'm a little stuck... Click here to teach me more about this clue!

'slight' is the definition.
('thin' can be similar in meaning to 'slight')

'subtle hint' is the wordplay.
'hint' anagrams to 'THIN'.
Though, I'm not sure how the anagram 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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