Flier with a large bill for fish (7)
I believe the answer is:
pelican
'flier' is the definition.
(pelican is a kind of birdanimal)
'a large bill for fish' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is located in the answer.
'large' could be 'l' (eg in clothes sizes) and 'l' is located in the answer.
This explanation may well be incorrect...
'with' is the link.
Can you help me to learn more?
(Other definitions for pelican that I've seen before include "One presenting big bill" , "Aquatic bird with pouch" , "Water bird with throat pouch for fish" , "Large-billed seabird" , "Large bird with enormous beak" .)