Granddad's wireless? (5)
I believe the answer is:
radio
This could be a double definition.
'granddad's' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'wireless?' is the second definition.
('radio' can be a synonym of 'wireless')
Can you help me to learn more?
(Other definitions for radio that I've seen before include "Marconi invented it" , "Sound receiver" , "Broadcast receiver" , "Broadcast medium" , "Receiving device" .)