Wants massages, so we hear (5)
I believe the answer is:
needs
'wants' is the definition.
(needing is a kind of wanting)
'massages so we hear' is the wordplay.
'massages' becomes 'kneads' ('knead' can be a synonym of 'massage').
'so we hear' shows a homophone (sound like).
'kneads' sounds like 'NEEDS'.
(Other definitions for needs that I've seen before include "Wants, requires" , "Demands" , "What we require" , "Can't do without" , "Necessities" .)