Loudspeaker for a dog? (6)

I believe the answer is:

woofer

I believe this is a double definition.

'loudspeaker' is the first definition.
(woofer is a kind of loudspeaker)

'a dog?' is the second definition.

'for' is the link.

(Other definitions for woofer that I've seen before include "Bass loudspeaker" , "sound booster?" , "Lab possibly" , "Low-frequency speaker" , "Loudspeaker that reproduces lower frequency sounds" .)

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app