God of good innings (4)
I believe the answer is:
odin
'god' is the definition.
(Norse god)
'of good innings' is the wordplay.
'of' says the answer is hidden in the clue.
'ODIN' is hidden within 'good innings'.
(Other definitions for odin that I've seen before include "mythological personage" , "Pagan god" , "Supreme Scandinavian god - what a racket" , "Chief god of Scandinavian myth" , "Old Scandinavian" .)