Constitutional nature's changed (7)

I believe the answer is:

saunter

'constitutional' is the definition.
(thesaurus)

'nature's changed' is the wordplay.
'changed' indicates anagramming the letters.
'natures' anagrammed gives 'SAUNTER'.

(Other definitions for saunter that I've seen before include "Leisurely stroll" , "'Amble, stroll (7)'" , "Amble along" , "Walk casually or jauntily" , "Relaxed stroll" .)

I've seen this clue in The Globe and Mail.

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