Further loan on security (7)
I believe the answer is:
advance
This could be a double definition.
'further' is the first definition.
(synonyms)
'loan on security' is the second definition.
'advance' can be an answer for 'loan' (I've seen this in another clue). I am not certain of the 'on security' bit.
Can you help me to learn more?
(Other definitions for advance that I've seen before include "Proceed" , "Lend money on security" , "Put forward (a theory)" , "capital" , "Go forwards" .)