Opt to change T-shirt (3)

I believe the answer is:

top

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

'shirt' is the definition.
(I've seen this in another clue)

'opt to change' is the wordplay.
'to change' is an anagram indicator.
'opt' anagrammed gives 'TOP'.

't' acts as a link.
I am not very happy about this link. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for top that I've seen before include "Uppermost part" , "Highest part" , "Upper side" , "Toy; uppermost point" , "premier" .)

I've seen this clue in The Mirror.

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