Loan's secured for each fine (6)
I believe the answer is:
superb
'fine' is the definition.
(I've seen this before)
'loan's secured for each' is the wordplay.
'loan' becomes 'sub' (I've seen this before).
'secured' is an insertion indicator (inserted letters secured inside).
'for each' becomes 'per' (per person).
'sub' going around 'per' is 'SUPERB'.
(Other definitions for superb that I've seen before include "First-class" , "Tiptop" , "Really excellent, brilliant" , "fine" , "Surpassingly good" .)