Bring a spanner back with the booty (4)
I believe the answer is:
loot
'booty' is the definition.
(I know that booty can be written as loot)
'bring a spanner back with the' is the wordplay.
'bring a spanner back' becomes 'loo' (I can't justify this - if you can you should give a lot more credence to this answer).
'with' means one lot of letters go next to another.
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'loo'+'t'='LOOT'
Can you help me to learn more?
(Other definitions for loot that I've seen before include "Orton play; ill-gotten gains" , "Haul" , "Pillage; money" , "Prize" , "Burglar's takings - pillage" .)