Settles each issue during prohibited period (5,6)
I believe the answer is:
close season
'period' is the definition.
(I have seen 'inactive period' mean 'close season' so perhaps 'period' could also mean 'close season')
'settles each issue' is the wordplay.
'settles' becomes 'closes' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'each' becomes 'ea'.
'issue' becomes 'son' (issue can mean someone's offspring).
'closes'+'ea'+'son'='CLOSE SEASON'
'during prohibited' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for close season that I've seen before include "Period when it is illegal to kill certain game" , "when the game is safe" , "Sport-free months" , "inactive period" , "Period when fishing is banned" .)