Started a fire again with a quantity of petrol (5)
I believe the answer is:
litre
'petrol' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'started a fire again with a quantity' is the wordplay.
'started a fire again' becomes 'lire' (I can't explain this - if you can you should believe this answer much more).
'with' indicates putting letters inside.
'a quantity' becomes 'T' (T is an example).
'lire' enclosing 't' is 'LITRE'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for litre that I've seen before include "Amount of liquid" , "Metric measure of capacity" , "Measure of liquid volume" , "French volume" , "non-imperial measure" .)