For a change study an interpretation (10)

I believe the answer is:

conversion

'for a change' is the definition.
(conversion is a kind of change)

'study an interpretation' is the wordplay.
'study' becomes 'con' (con can informally mean to study).
'an interpretation' becomes 'version' (synonyms).
'con'+'version'='CONVERSION'

(Other definitions for conversion that I've seen before include "Religious experience" , "change of heart" , "necessary to achieve a goal" , "Paul's Damascene experience" .)

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

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