A new banknote should be announced one feels (7)
I believe the answer is:
antenna
'one feels' is the definition.
(an antenna feels things)
'a new banknote should be announced' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is present in the answer.
'new' could be 'n' (common abbreviation eg NT for New Testament) and 'n' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for antenna that I've seen before include "Aerial - insect feeler" , "could send out a message" , "receiver" , "one feels" , "connected to 41?" .)