Crossword Genius

Sandpiper in difficulty (4)

Ross

I believe the answer is:

knot

I believe this is a double definition.

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

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

'in' acts as a link.

(Other definitions for knot that I've seen before include "Shore bird, tangle" , "Shore bird; cluster" , "that's sometimes in wood" , "Unit of speed in water" , "Fastening - unit of speed" .)

I've seen this clue in The Telegraph, The Globe and Mail and The Guardian.
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