Packer's dogs? (6)
I believe the answer is:
boxers
I believe this clue is a double definition.
'packer's' is the first definition.
(I know this)
'dogs?' is the second definition.
(boxer is a kind of dog)
(Other definitions for boxers that I've seen before include "Men's shorts for pugilists" , "Pugilists or men's underwear" , "Pugs; dogs" , "Dogs or pugilists" , "Dogs; packers" .)