Book every purchase made about viceroy's vehicle (5,5)
I believe the answer is:
beach buggy
'about viceroy's vehicle' is the definition.
'beach buggy' can be an answer for 'vehicle' (vehicle on a beach). I am not certain of the 'about viceroy's' bit.
'book every purchase' is the wordplay.
'book' becomes 'b' (abbreviation for book).
'every' becomes 'each' (synonyms).
'purchase' becomes 'buggy' (I can't justify this - if you can you should give a lot more credence to this answer).
'b'+'each'+'buggy'='BEACH BUGGY'
'made' acts as a link.
Can you help me to learn more?
(Other definitions for beach buggy that I've seen before include "Seaside transport" , "Motor vehicle for the seashore" , "Vehicle to be driven on sand" , "open car" , "Transport with balloon tyres for driving on sand" .)