Hounds those arrested by Boris Godunov, on reflection (4)
I believe the answer is:
dogs
'hounds' is the definition.
(I know this)
'arrested by boris godunov on reflection' is the wordplay.
'arrested by' says the answer is hidden in the clue (the answer is held or arrested by the clue).
'on reflection' shows that the letters should be reversed in order.
'sgod' is hidden within 'boris godunov'.
'sgod' reversed gives 'DOGS'.
'those' is the link.
This may not be correct. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for dogs that I've seen before include "eg 27 terriers" , "Pursues" , "Setters, for example" , "Shadows" , "Hounds" .)