Narrow in his limitations (4)

I believe the answer is:

slim

'narrow' is the definition.
(I've seen this in another clue)

'in his limitations' is the wordplay.
'in' indicates the answer is hidden within the clue.
'SLIM' can be found hidden inside 'his limitations'.

(Other definitions for slim that I've seen before include "Shed excess weight" , "Svelte" , "Gracefully thin" , "Take off weight as by dieting" , "Thin; WWtwo Burma commander" .)

I've seen this clue in The Mirror.

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