Dictator with old twitch is stupid (7)

I believe the answer is:

idiotic

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

'dictator with old twitch' is the wordplay.
'dictator with' becomes 'idi' (I can't explain this - if you can you should give a lot more credence to this answer).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'twitch' becomes 'tic' (tic is a kind of twitch).
'idi'+'o'+'tic'='IDIOTIC'

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(Other definitions for idiotic that I've seen before include "without intelligence" , "without any point" , "Inviting ridicule" , "half-baked" , "Stupid, foolish" .)

I've seen this clue in The Daily Express.

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