Wad of banknotes or maybe fifty pounds (4)

I believe the answer is:

roll

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'wad of banknotes' is the definition.
'roll' can be an answer for 'wad' (I've seen this in another clue). I'm not sure about the 'of banknotes' bit.

'or maybe fifty pounds' is the wordplay.
'maybe' is an anagram indicator.
'fifty' becomes 'l' (Roman numeral).
'pounds' becomes 'l' (L can represent the monetary pound).
'or' is an anagram of 'ro'.
'ro'+'l'+'l'='ROLL'

Can you help me to learn more?

(Other definitions for roll that I've seen before include "Go over and over" , "Drums sound" , "Gymnastic move; bread" , "Move by turning over" , "Register - for continental breakfast?" .)

I've seen this clue in the Evening Standard.

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