Crossword Genius

One tying the knot? (7)

Ross

I believe the answer is:

hitcher

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

'one tying' is the definition.
The definition suggests a singular noun which matches the answer.

'knot?' is the wordplay.
I cannot quite see how this works, but
'knot?' could be 'hitch' (hitch is a kind of knot) and 'hitch' is located in the answer.
The remaining letters 'er' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'the' is the link.

Can you help me to learn more?

(Other definitions for hitcher that I've seen before include "I count on thumb" , "traveller" , "one determined to get somewhere" .)

I've seen this clue in The Sun.
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