Crossword Genius

Granddad's wireless? (5)

Ross

I believe the answer is:

radio

I'm a little stuck... Click here to teach me more about this clue!

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" .)

I've seen this clue in the Evening Standard.
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