Crossword Genius

Something used by angler for river fish? (4)

Ross

I believe the answer is:

reel

I'm a little stuck... Click here to teach me more about this clue!

'something' is the definition.
(I know that reel is a type of something)

'river fish?' is the wordplay.
'river' becomes 'r' (abbreviation).
'fish?' becomes 'eel' (eel is a type of fish).
'r'+'eel'='REEL'

'used by angler for' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for reel that I've seen before include "long stretch of film" , "Dance; winding cylinder" , "The angler pulls in his line using this" , "Part of a film; stagger" , "Film spool" .)

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