Refuse working with internatÂional telecom pioneer (7)
I believe the answer is:
marconi
'pioneer' is the definition.
(I have seen 'Pioneer of wireless' mean 'marconi' so perhaps 'pioneer' could also mean 'marconi')
'refuse working with international' is the wordplay.
'refuse' becomes 'marc' (discarded material in winemaking).
'working' becomes 'on' (on can mean working or activated).
'with' is a charade indicator (letters next to each other).
'international' becomes 'i' (abbreviation eg in IMF).
'marc'+'on'+'i'='MARCONI'
'telecom' acts as a link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for marconi that I've seen before include "Wireless inventor from Minorca" , "Italian electrical engineer, d. 1937" , "Communications pioneer" , "Guglielmo --, inventor" , "Nobel prizewinner" .)