Learning duty's to be changed (5)

I believe the answer is:

study

'learning' is the definition.
(study is a kind of learning)

'duty's to be changed' is the wordplay.
'to be changed' indicates anagramming the letters.
'dutys' anagrammed gives 'STUDY'.

(Other definitions for study that I've seen before include "Scrutinise" , "Den - learning" , "Read to learn" , "Den; a practice drawing" , "Something worth observing" .)

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

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