Decline in entrance to finish one off (7)

I believe the answer is:

garotte

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

'finish one off' is the definition.
I can't judge whether this defines the answer.

'decline in entrance' is the wordplay.
'decline' becomes 'rot' (I've seen this before).
'in' indicates putting letters inside.
'entrance' becomes 'gate' (type of entrance).
'rot' going within 'gate' is 'GAROTTE'.

'to' is the link.

Can you help me to learn more?

(Other definitions for garotte that I've seen before include "Kill by strangulation" , "throttle" , "Spanish method of execution" , "Facility to dispose of person" , "Strangle" .)

I've seen this clue in The Hindu.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.