Line subsequently adopted in fuel asset (10)
I believe the answer is:
collateral
'asset' is the definition.
The definition and answer can be both related to property as well as being singular nouns.
Maybe there's an association between them I don't understand?
'line subsequently adopted in fuel' is the wordplay.
'line' becomes 'l' (used when specifying particular lines from a poem).
'subsequently' becomes 'later' (subsequently means later on).
'adopted in' means one lot of letters goes inside another (inserted letters are welcomed or adopted).
'fuel' becomes 'coal' (coal is a kind of fuel).
'l'+'later'='llater'
'llater' placed within 'coal' is 'COLLATERAL'.
Can you help me to learn more?
(Other definitions for collateral that I've seen before include "Confirmatory - recall a lot (anag)" , "subsidiary" , "Guarantee" , "Money put up" , "Aside from the main issue" .)