Ring to interpret for nymph (5)
I believe the answer is:
oread
'for nymph' is the definition.
(I've seen this before)
'ring to interpret' is the wordplay.
'ring' becomes 'O' (letter resembling a ring).
'to interpret' becomes 'read' ('read' can be a synonym of 'interpret').
'o'+'read'='OREAD'
(Other definitions for oread that I've seen before include "being in range?" , "mountainous girl" , "Natural spirit" , "Maid of the Mountains" , "classically beautiful girl" .)