I catch fish taking craft round lake on test (9)
I believe the answer is:
guillemot
'i catch fish' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'craft round lake on test' is the wordplay.
'craft' becomes 'guile' ('guile' can be a synonym of 'craft'**).
'round' is an insertion indicator.
'lake' becomes 'l'.
'on' is a charade indicator (letters next to each other).
'test' becomes 'mot'.
'guile' enclosing 'l' is 'guille'.
'guille'+'mot'='GUILLEMOT'
'taking' is the link.
Can you help me to learn more?
(Other definitions for guillemot that I've seen before include "Seabird" , "Diving bird" , "Diver" , "An auk" , "cliff-ledge nester" .)