Call corporation endlessly (4)
I believe the answer is:
bell
'call' is the definition.
(bell can mean a phone call)
'corporation endlessly' is the wordplay.
'corporation' becomes 'belly' (corporation can humorously mean belly fat).
'endlessly' means to remove the last letter.
'belly' with its last letter removed is 'BELL'.
(Other definitions for bell that I've seen before include "Buzz" , "Wide end of a trumpet" , "Instrument making ringing sound" , "Metal instrument" , "pen name" .)