Boy’s got the wrong underwear, or is it the dog? (8)
I believe the answer is:
labrador
'the dog?' is the definition.
(I've seen this before)
'boy's got the wrong underwear or' is the wordplay.
'boy' becomes 'lad' (informal term for boy).
'got' means one lot of letters goes inside another.
'the wrong underwear' becomes 'bra' (bra is a type of undergarment. I am not sure about the 'wrong' bit.).
'lad' enclosing 'bra' is 'labrad'.
'labrad'+'or'='LABRADOR'
'is it' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for labrador that I've seen before include "Coastal region of eastern Canada" , "Breed of gun dog" , "One that may have gone out with the guns" , "Part of Newfoundland" , "Canadian region and dog-breed" .)