English number; singing is lovely (10)
I believe the answer is:
enchanting
'is lovely' is the definition.
(I've seen this before)
'english number singing' is the wordplay.
'english' becomes 'E' (abbreviation).
'number' becomes 'n' (n can represent any number).
'singing' becomes 'chanting' (chanting is a kind of singing).
'e'+'n'+'chanting'='ENCHANTING'
(Other definitions for enchanting that I've seen before include "Bewitching" , "Delightful" , "Beguiling" , "occupation Circe undertook" , "Lovely" .)