Authorise adjustment - it lengthens trousers (7)

I believe the answer is:

entitle

'authorise' is the definition.
(I know that entitle is a more specific form of the action authorise)

'adjustment it lengthens trousers' is the wordplay.
'trousers' indicates a hidden word (trouser can mean to steal or take).
'ENTITLE' is hidden in the letters of 'adjustment it lengthens'.

(Other definitions for entitle that I've seen before include "Call; permit" , "Name; empower" , "Give (someone) rights" , "Name; enable" , "Give a right or authority to" .)

I've seen this clue in The Independent.

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