Deviations of French Impressionism - possibly hidden away by chaste society (10)
I believe the answer is:
departures
'deviations' is the definition.
('departure' can be a synonym of 'deviation')
'of french impressionism possibly hidden away by chaste society' is the wordplay.
I cannot quite understand how this works, but
'away' could be 'a' (abbreviation as used in sports fixtures) and 'a' is present in the answer.
'society' could be 's' (common abbreviation in names of organisations) and 's' is found within the answer.
'of french' could be 'de' ('of' in French) and 'de' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for departures that I've seen before include "changes" , "leavings" .)