Hearty emotion produced in telephone call: "Lay off, that's disgusting!" (5,5)
I believe the answer is:
belly laugh
'hearty emotion' is the definition.
(a loud, hearty laugh)
'telephone call lay off that's disgusting' is the wordplay.
'telephone call' becomes 'bell' (bell can mean a phone call).
'off' is an anagram indicator.
'that's disgusting' becomes 'ugh' (expression of disgust).
'lay' anagrammed gives 'yla'.
'bell'+'yla'+'ugh'='BELLY-LAUGH'
'produced in' is the link.
(Other definitions for belly laugh that I've seen before include "Loud guffaw" , "Loud reaction to humour" , "Huge guffaw" , "Unrestrained guffaw" .)