Bit of a nerve, getting news about currency (6)
I believe the answer is:
neuron
'bit of a nerve' is the definition.
'news about currency' is the wordplay.
'news' becomes 'nn' (an abbreviation for new written twice).
'about' indicates putting letters inside.
'currency' becomes 'euro' (currency of the Eurozone).
'nn' placed around 'euro' is 'NEURON'.
'getting' acts as a link.
(Other definitions for neuron that I've seen before include "Cell that conducts nerve impulses" , "Transmitting nerve cell" , "It transmits nerve impulses" , "Part of one's nervous system" , "that makes for nervous transmission" .)