Crossword Genius

Tyre part found underground (4)

Ross

I believe the answer is:

tube

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

This clue might be a double definition.

'tyre part' is the first definition.
'tube' can be an answer for 'part' (tube is a kind of part). I'm unsure of the 'tyre' bit.

'underground' is the second definition.
(the London Underground is nicknamed the Tube)

'found' acts as a link.

Can you help me to learn more?

(Other definitions for tube that I've seen before include "train network" , "Pipe - railway" , "Hollow cylindrical object" , "appearing tinny?" , "Long, hollow cylinder" .)

I've seen this clue in The Mirror.
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