Change to 'all clear' bringing security (10)
I believe the answer is:
collateral
'security' is the definition.
(collateral is a kind of security)
'change to all clear' is the wordplay.
'change' indicates anagramming the letters.
'to'+'all'+'clear'='toallclear'
'toallclear' with letters rearranged gives 'COLLATERAL'.
'bringing' is the link.
(Other definitions for collateral that I've seen before include "damage?" , "Aside from the main issue" , "Guarantee" , "Money put up" , "subsidiary" .)