Crossword Genius

Speaker is the underdog (9)

Ross

I believe the answer is:

subwoofer

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

'speaker' is the definition.
(type of speaker)

I can't explain the rest of the clue.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
Want a hint initially instead of a full solution? Install my app