An angling term meaning 'reel' (4)
I believe the answer is:
swim
'reel' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for swim that I've seen before include "German submarine" , "Crawl, e.g." , "Go for a dip" , "Take a dip" , "Float - feel dizzy" .)