Strike repeatedly for money (5)

I believe the answer is:

pound

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'strike repeatedly' is the first definition.
'pound' can be an answer for 'strike' (thesaurus). I am not sure about the 'repeatedly' bit.

'for money' is the second definition.
(pound sterling)

Can you help me to learn more?

(Other definitions for pound that I've seen before include "Beat; money" , "Repeatedly strike" , "Egyptian currency" , "Money - belt" , "Caged poet" .)

I've seen this clue in the Evening Standard.

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