One's often in meadow making love — it's wrong to look (5)
I believe the answer is:
oxeye
'one's often in meadow' is the definition.
'love it's wrong to look' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'it's wrong' becomes 'x'.
'to' is a charade indicator (letters next to each other).
'look' becomes 'eye' (eyeing is a kind of looking**).
'o'+'x'+'eye'='OXEYE'
'making' is the link.
(Other definitions for oxeye that I've seen before include "Plant with daisy-like flowers" , "Flower; _ daisy" , "Flowering herb" , "White and yellow daisy" , "Variety of daisy" .)