Scrap part of parachute jump to protect soldiers (4-3-3)
I believe the answer is:
free-for-all
'scrap' is the definition.
(I know that free-for-all is a type of scrap)
'parachute jump to protect soldiers' is the wordplay.
'parachute jump' becomes 'free fall' (I've seen this in another clue).
'to protect' means one lot of letters goes inside another (inserted letters are held or protected).
'soldiers' becomes 'OR' (Other Ranks).
'freefall' enclosing 'or' is 'FREE-FOR-ALL'.
'part of' is the link.
(Other definitions for free-for-all that I've seen before include "Public brawl" , "Disorganised event" .)