Force set to be disbanded without penalty (4-4)
I believe the answer is:
scot-free
'without penalty' is the definition.
(I've seen this before)
'force set to be disbanded' is the wordplay.
'to be disbanded' is an anagram indicator (I've seen this in other clues).
'force'+'set'='forceset'
'forceset' with letters rearranged gives 'SCOT-FREE'.
(Other definitions for scot-free that I've seen before include "Secret of being unpunished - like Jock?" , "'Without any punishment whatsoever (4,4)'" , "Unharmed, not punished like kilted gent" , "Completely without penalty" , "(Get away) incurring no penalty" .)