When nothing is restricting, as one’s slaughtered? (4,6)
I believe the answer is:
open season
'when' is the definition.
I know nothing about this answer so I can't tell whether this works.
'nothing is restricting as one's slaughtered?' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'is restricting' becomes 'pens' (pen can mean to restrict or enclose).
'slaughtered?' indicates anagramming the letters (I've seen 'slaughtered' mean this).
'as'+'one'='asone'
'asone' anagrammed gives 'eason'.
'o'+'pens'+'eason'='OPEN SEASON'
Can you help me to learn more?
(Other definitions for open season that I've seen before include "When game shootable" , "period designated for shooting" , "enjoyed by some sportsmen" , "anyone could be opposition here" , "When killing is permitted" .)