Crossword Genius

A tie is an accessory (10)

Ross

I believe the answer is:

attachment

I believe this is a double definition.

'a tie' is the first definition.
(thesaurus)

'an accessory' is the second definition.
(thesaurus)

'is' acts as a link.

(Other definitions for attachment that I've seen before include "Affinity" , "File with an email" , "communicated via e-mail" , "devotion" , "what might accompany 50 [EMAIL]" .)

I've seen this clue in The Sunday Times.
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