Pound notes and the euros for gambler, all in the middle (5)
I believe the answer is:
throb
'pound' is the definition.
(throbbing is a kind of pounding)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for throb that I've seen before include "Sound of engines" , "Pulse" , "Vibrate with rhythm like heart" , "Have strong or irregular heartbeat" , "Beat quickly from excitement etc" .)