Issue of the day, say, being gone over (4)
I believe the answer is:
emit
'issue' is the definition.
(thesaurus)
'the day say being gone over' is the wordplay.
'the day say' becomes 'time' (day is a kind of time).
'being gone over' shows that the letters should be reversed in order.
'time' backwards is 'EMIT'.
'of' acts as a link.
(Other definitions for emit that I've seen before include "Expel" , "Give out or put forth" , "Exhale" , "'Give off, odour say (4)'" , "Throw out" .)