A shirt-tail that is worn (3)

I believe the answer is:

tie

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

'a shirt-tail that is worn' is the definition.
I can't tell whether this defines the answer.

'a shirt-tail that is' is the wordplay.
'tail' suggests the final letters.
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
The final letter of 'shirt' is 't'.
't'+'ie'='TIE'

Can you help me to learn more?

(Other definitions for tie that I've seen before include "Knot; achieve the same score" , "Bind with a cord" , "Secure (with string)" , "Encumbrance" , "Restrict; link" .)

I've seen this clue in the Evening Standard.

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.