Crossword Genius

With which to pick up sound of jumbo in Bow? (3,7)

Ross

I believe the answer is:

ear trumpet

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'jumbo in bow?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'with which to pick up sound' is the wordplay.
I cannot really see how this works, but
'sound' could be 'trump' (trumping is a kind of sounding) and 'trump' is found in the answer.
This explanation may well be incorrect...

'of' acts as a link.

Can you help me to learn more?

(Other definitions for ear trumpet that I've seen before include "Early hearing aid" , "Primitive hearing aid" , "eight [HEARING AID]" , "sound engineering device" , "Hearing piece" .)

I've seen this clue in The Times.
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