With which to pick up a northern male voice on the radio? (7)
I believe the answer is:
antenna
'with which to pick up' is the definition.
(an antenna might pick up a radio signal)
'a northern male voice on the radio?' is the wordplay.
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'male voice' becomes 'tenor' (type of singing voice).
'on the radio?' shows a homophone (sound like) (I've seen 'on the radio' mean this).
'tenor' sounds like 'tenna'.
'a'+'n'+'tenna'='ANTENNA'
(Other definitions for antenna that I've seen before include "could send out a message" , "Insect's feeler" , "Insect's sensory appendage" , "Feature of dish" , "Feeling part" .)