Wanting massaging, by the sound of it (7)
I believe the answer is:
needing
'wanting' is the definition.
(needing is a kind of wanting)
'massaging by the sound of it' is the wordplay.
'massaging' becomes 'kneading' ('knead' can be a synonym of 'massage').
'by the sound of it' indicates a 'sounds like' (homophone) clue.
'kneading' sounds like 'NEEDING'.
(Other definitions for needing that I've seen before include "Eden gin (anag.)" , "Short of, lacking" , "Requiring" , "Wanting" .)