Crossword Genius

Radical dictators take to posturing (7)

Ross

I believe the answer is:

drastic

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'radical dictators take to posturing' is the definition.
I can't tell whether this defines the answer.

'radical dictators take to' is the wordplay.
'radical' indicates an anagram.
'take' is a deletion indicator.
'dictators' with 'to' removed is 'dictars'.
'dictars' with letters rearranged gives 'DRASTIC'.

Can you help me to learn more?

(Other definitions for drastic that I've seen before include "Extreme - violent" , "Severe - powerful" , "Radical, brutal" , "Radical, extreme" , "Having strong effect" .)

I've seen this clue in The Telegraph.
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