Crossword Genius

Secure measure of speed for flyer (4)

Ross

I believe the answer is:

knot

I believe this clue is a quadruple definition!!

'secure' is the first definition.
(I know that knot is a type of bind)

'measure' is the second definition.
(knot is a kind of measure)

'of' acts as a link.

'speed' is the third definition.
(I've seen this before)

'for flyer' is the fourth definition.
(type of bird)

(Other definitions for knot that I've seen before include "Fastener - bird - unit of speed at sea" , "To secure < > bird" , "Bird; tie securely" , "Unit of length used in navigation" , "Nodule" .)

I've seen this clue in The Independent.
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