Crossword Genius

Making only one knot, perhaps (5)

Ross

I believe the answer is:

tying

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'making' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I can't explain the rest of the clue.

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(Other definitions for tying that I've seen before include "Binding, fastening" , "lacing" , "Linking" , "Scoring the same" , "restrictive" .)

I've seen this clue in the Evening Standard.
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