Katy ends getting into old Asiatic nomad fish? Fine! (5-4)
I believe the answer is:
hunky-dory
'fine' is the definition.
(I know that fine can be written as hunky-dory)
'katy ends getting into old asiatic nomad fish?' is the wordplay.
'ends' suggests removing the centre.
'getting into' indicates putting letters inside.
'old asiatic nomad' becomes 'hun' (I am not sure about this - if you are sure you should believe this answer much more).
'fish?' becomes 'dory' (dory is a kind of fish).
'katy' with its middle removed is 'ky'.
'hun'+'dory'='hundory'
'ky' going within 'hundory' is 'HUNKY-DORY'.
Can you help me to learn more?
(Other definitions for hunky-dory that I've seen before include "Excellent - fine" , "A-OK" , "In excellent condition" .)