Error with nautical speed? Tug will put paid to it (8)
I believe the answer is:
slipknot
'tug will put paid to it' is the definition.
I can't tell whether this definition defines the answer.
'error with nautical speed?' is the wordplay.
'error' becomes 'slip' (slip is a kind of error).
'with' says to put letters next to each other.
'nautical speed?' becomes 'knot' (I've seen this in another clue).
'slip'+'knot'='SLIPKNOT'
Can you help me to learn more?
(Other definitions for slipknot that I've seen before include "With which noose is tied" , "connector - with 12a" , "Something tied but easily undone" .)