Showy carp (3)
I believe the answer is:
koi
'showy carp' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for koi that I've seen before include "Japanese fish" , "Japanese type of carp" , "Carp; sounds like shy" , "Large Japanese carp" , "Ornamental carp variety" .)