It's of all-round satisfaction to a baseballer (4,3)
I believe the answer is:
home run
'all-round satisfaction to a baseballer' is the definition.
I can't tell whether this defines the answer.
'it's of' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is found within the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for home run that I've seen before include "Baseball achievement" , "Baseball score" , "Baseball hit allowing complete circuit to batter" , "In baseball, it allows batter to move through all bases" , "Achievement by a sporting all-rounder" .)