Speed at the bend, perhaps? (4)
I believe the answer is:
knot
This clue could be a double definition.
'speed at' is the first definition.
'knot' can be an answer for 'speed' (knot is a nautical measure of speed). I am unsure of the 'at' bit.
'bend perhaps?' is the second definition.
'knot' can be an answer for 'bend' (thesaurus). I am unsure of the 'perhaps?' bit.
'the' acts as a link.
Can you help me to learn more?
(Other definitions for knot that I've seen before include "Tie; group" , "Tight interlacing of cord, string etc" , "Nodule" , "Something tied" , "Fastener - bird - unit of speed at sea" .)