Call for massage, loudly (4)
I believe the answer is:
need
'call for' is the definition.
(synonyms)
'massage loudly' is the wordplay.
'massage' becomes 'knead' (synonyms).
'loudly' indicates a 'sounds like' (homophone) clue (when spoken - not silently).
'knead' is a homophone of 'NEED'.
(Other definitions for need that I've seen before include "Call" , "Shortage" , "Require (as essential)" , "A condition" , "Want - poverty" .)