Shot a boss, given permission! (2,5)
I believe the answer is:
go ahead
'permission' is the definition.
(thesaurus)
'shot a boss given' is the wordplay.
'shot' becomes 'go' (I've seen this in other clues**).
'boss' becomes 'head' ('head' can be a synonym of 'boss').
'given' says to put letters next to each other.
'go'+'a'+'head'='GO-AHEAD'
(Other definitions for go ahead that I've seen before include "Permission to proceed" , "dynamic" , "Enterprising (2 5); continue" , "Signal to proceed" , "[ENERGETIC]" .)