Love to study mountain nymph (5)
I believe the answer is:
oread
'mountain nymph' is the definition.
(I've seen this before)
'love to study' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'to study' becomes 'read' ('read' can be a synonym of 'study'**).
'o'+'read'='OREAD'
(Other definitions for oread that I've seen before include "classically beautiful girl" , "Maid of the Mountains" , "Natural spirit" , "being in range?" , "O dear, a strange mountain nymph" .)