Crossword Genius

Shore bird in difficulty (4)

Ross

I believe the answer is:

knot

I believe this is a double definition.

'shore bird' is the first definition.
(knot is a kind of shore bird)

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

'in' is the link.

(Other definitions for knot that I've seen before include "Something tied" , "Ring < sandpiper" , "Small cluster - huddled group - sheepshank, for example" , "Bird; hard part in wood" , "Measure of speed at sea" .)

I've seen this clue in The Times.
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