Crossword Genius

Wading bird that may be on reef? (4)

Ross

I believe the answer is:

knot

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

This could be a double definition.

'wading bird that may be' is the first definition.
'knot' can be an answer for 'wading bird' (knot is a kind of wading bird). I am unsure of the rest of the definition.

'reef?' is the second definition.
(I've seen this before)

'on' acts as a link.

Can you help me to learn more?

(Other definitions for knot that I've seen before include "Gnarl" , "Tie cord - lump in timber" , "It may be tied" , "Nautical measure" , "To secure < > bird" .)

I've seen this clue in The Telegraph.
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