Issue returning underwriter had (7)
I believe the answer is:
emanate
'issue' is the definition.
(both can mean to give out or radiate)
'returning underwriter had' is the wordplay.
'returning underwriter' becomes 'eman' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'had' becomes 'ate' ('have' can mean 'eat').
'eman'+'ate'='EMANATE'
Can you help me to learn more?
(Other definitions for emanate that I've seen before include "Rise" , "Proceed or issue forth" , "Come out (of source)" , "Issue forth, from a source" , "Manatee (anag.)" .)