Poles pocketing coin in cell (6)
I believe the answer is:
neuron
'cell' is the definition.
(neuron is a kind of cell)
'poles pocketing coin' is the wordplay.
'poles' becomes 'NN' (two N's - as in the North Pole).
'pocketing' is an insertion indicator (pocket can mean to steal or take possession of).
'coin' becomes 'euro' (I am not sure about this - if you are sure you should believe this answer much more).
'nn' going around 'euro' is 'NEURON'.
'in' is the link.
Can you help me to learn more?
(Other definitions for neuron that I've seen before include "Nerve impulse cell" , "Part of one's nervous system" , "Transmitter of nerve impulses" , "that makes for nervous transmission" , "Transmitting nerve cell" .)