Where Oscar Wilde spent time studying (7)
I believe the answer is:
reading
'studying' is the definition.
('read' can be a synonym of 'study')
'where oscar wilde spent time' is the wordplay.
I cannot really see how this works, but
'time' could be 'ad' (AD, Anno Domini, as opposed to BC, Before Christ) and 'ad' is found in 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 reading that I've seen before include "Literacy" , "Book" , "Grained (anag)" , "Where Oscar Wilde penned" , "Perusing in an English town?" .)