Thin in his limitation (4)

I believe the answer is:

slim

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

'in his limitation' is the wordplay.
'in' says the answer is hidden in the clue.
'SLIM' can be found hidden inside 'his limitation'.

(Other definitions for slim that I've seen before include "Very small; WW2 Burma commander" , "Take off weight as by dieting" , "(Of chance) very slight" , "Elegantly thin or slender" , "Gracefully thin" .)

I've seen this clue in The Mirror.

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