High spirits of auntie, perhaps going topless (7)
I believe the answer is:
elation
'high spirits' is the definition.
('elation' can be a synonym of 'high spirits')
'auntie perhaps going topless' is the wordplay.
'auntie perhaps' becomes 'relation' (auntie is a kind of relation).
'going topless' means to remove the first letter.
'relation' with its initial letter taken off is 'ELATION'.
'of' acts as a link.
(Other definitions for elation that I've seen before include "Feeling of joy from toenail" , "There's great joy" , "State of being delighted or proud" , "Delight, ecstasy" , "It's a great feeling!" .)