Spent greenbacks when touring Spain? (4)
I believe the answer is:
used
'spent' is the definition.
(I've seen this in another clue)
'greenbacks when touring spain?' is the wordplay.
'greenbacks when' becomes 'usd' (I can't explain this - if you can you should believe this answer much more).
'touring' is an insertion indicator (touring can mean going round).
'spain?' becomes 'e' (abbreviation for Espana).
'usd' placed around 'e' is 'USED'.
Can you help me to learn more?
(Other definitions for used that I've seen before include "with some traffic" , "took a chance on becoming dependent" , "like majority of cars?" , "Subject to exploitation" , "Sued (anag.)" .)