Diplomat has to cheat at competition

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)

'to cheat at competition' is the wordplay.
'cheat at' anagrams to 'ATTACHE'.
However, I'm not sure how the anagram is indicated.

'has' is the link.

Can you help me to learn more?

(Other definitions for attache that I've seen before include "Military assistant" , "One on embassy staff" , "Diplomatic official" , "ambassador's assistant" , "Embassy member" .)

I've seen this clue in The Irish Independent.

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