Fish in an ornamental pond (3)
I believe the answer is:
koi
'fish in an ornamental pond' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for koi that I've seen before include "sort of fish" , "Carp; sounds like shy" , "Sort of carp" , "Colourful ornamental carp" , "Japanese type of carp" .)