Travelling around with fifty pounds in toll (7)
I believe the answer is:
rolling
'travelling' is the definition.
(rolling is a kind of travelling)
'with fifty pounds in toll' is the wordplay.
'with' means one lot of letters goes inside another.
'fifty' becomes 'l' (roman numeral).
'pounds' becomes 'l' (L can represent the monetary pound).
'toll' becomes 'rog' (I can't explain this - if you can you should give a lot more credence to this answer).
'l'+'l'+'in'='llin'
'llin' inserted within 'rog' is 'ROLLING'.
'around' acts as a link.
Can you help me to learn more?
(Other definitions for rolling that I've seen before include "Type of stock" , "being so drunk?" , "extremely rich" , "Going round - a type of mill" , "Member of musical group ..." .)