As fish may be served, celebrate catching one (8)
I believe the answer is:
boneless
'as fish may be' is the definition.
I can't tell whether this definition defines the answer.
'celebrate catching one' is the wordplay.
'celebrate' becomes 'bless' (I can't justify this - if you can you should give a lot more credence to this answer).
'catching' indicates putting letters inside.
'bless' going around 'one' is 'BONELESS'.
'served' is the link.
Can you help me to learn more?
(Other definitions for boneless that I've seen before include "lacking courage?" , "Filleted" , "without skeleton?" .)