Find there's money to earn (5)
I believe the answer is:
learn
'find' is the definition.
(I've seen this before)
'there's money to earn' is the wordplay.
'there's' says to put letters next to each other.
'money' becomes 'l' (L can mean 'pounds').
'l'+'earn' is 'LEARN'.
(Other definitions for learn that I've seen before include "Gain knowledge or skill" , "Take in" , "Pick up" , "Commit to memory" , "teach illiterate" .)