Unsecured (5)
I believe the answer is:
loose
'unsecured' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for loose that I've seen before include "Slack or immoral" , "Lax or at large" , "Unfixed" , "Slack; not exact" , "Lax - inaccurate - unbound" .)