Crossword Genius

Associate of diplomat Spain expelled (6)

Ross

I believe the answer is:

attach

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'associate' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for attach that I've seen before include "Append, join" , "Affix, connect" , "Add on to, couple" , "Join, connect" , "Tag on" .)

I've seen this clue in The Telegraph.
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