Heartless Nixon hides money here - what nerve! (6)

I believe the answer is:

neuron

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'nerve' is the definition.
(thesaurus)

'heartless nixon hides money' is the wordplay.
'heartless' means to remove the middle letters.
'hides' is an insertion indicator.
'money' becomes 'euro' (currency of the Eurozone).
'nixon' with its centre taken out is 'nn'.
'nn' placed around 'euro' is 'NEURON'.

'here what' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for neuron that I've seen before include "that makes for nervous transmission" , "Nerve impulse cell" , "Cell that conducts nerve impulses" , "Conductor" , "It transmits nerve impulses" .)

I've seen this clue in The Irish Times.

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