Meat a dog has taken aboard (6)
I believe the answer is:
mutton
'meat' is the definition.
(mutton is a kind of meat)
'a dog has taken aboard' is the wordplay.
I cannot quite see how this works, but
'dog' could be 'mutt' (mutt is a kind of dog) and 'mutt' is present in the answer.
'aboard' could be 'on' (eg on a ship or train) and 'on' is located in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for mutton that I've seen before include "Sheep as food" , "Flesh of sheep" , "can be eaten" , "Sheep's meat" , "Sheep's flesh" .)