That man with £500 set aside (4)
I believe the answer is:
held
'set aside' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives sometimes mean the same thing.
'that man with ps500' is the wordplay.
'that man' becomes 'he' (he refers to a man).
'with' means one lot of letters go next to another.
'ps500' becomes 'ld' (I can't explain this - if you can you should give a lot more credence to this answer).
'he'+'ld'='HELD'
Can you help me to learn more?
(Other definitions for held that I've seen before include "Detained" , "Retained; grasped" , "Grasped, carried" , "Clasped" , "Defended successfully" .)