Pretty as a dog may be (8)
I believe the answer is:
fetching
'pretty' is the definition.
(I've seen this before)
'as a dog may be' is the wordplay.
I cannot quite understand how this works, but
'as' could be 'in' (I've seen this in other clues) and 'in' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for fetching that I've seen before include "a delight" , "charming" , "Pretty" , "Attractive; bringing" , "collection" .)