Invest using terms for the loan your honour (6)
I believe the answer is:
enrobe
'invest' is the definition.
(thesaurus)
'terms for the loan your honour' is the wordplay.
'terms for' suggests the final letters (I've seen 'term for' mean this (the letter which terminates the word)).
'honour' becomes 'obe' (Order of the British Empire award).
The last letters of 'the loan your' are 'enr'.
'enr'+'obe'='ENROBE'
'using' acts as a link.
(Other definitions for enrobe that I've seen before include "put on formally ..." , "Don a vestment" , "Dress, put on vestments" , "Fancy" , "Clad ceremonially" .)