Shiftily cheat at being a diplomat (7)

I believe the answer is:

attache

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

'diplomat' is the definition.
(I know that attache is a type of diplomat)

'shiftily cheat at being a' is the wordplay.
'cheat at' anagrams to 'ATTACHE'.
But, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for attache that I've seen before include "Embassy member" , "Embassy official" , "Specialist on embassy staff" , "Embassy worker" , "Connected to the French" .)

I've seen this clue in the Evening Standard.

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