General secretary with the wrong idea (4)

I believe the answer is:

aide

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'general' is the definition.
(thesaurus)

'secretary with the wrong idea' is the wordplay.
'idea' anagrams to 'AIDE'.
Though, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for aide that I've seen before include "Military officer acting as assistant" , "Adviser or assistant" , "Right-hand man/woman" , "Second" , "one helping" .)

I've seen this clue in the Evening Standard.

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