Those who mesmerize pythons sit uneasily (10)

I believe the answer is:

hypnotists

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'those who mesmerize' is the definition.
The definition suggests an adverb but the answer is not.

'pythons sit uneasily' is the wordplay.
'uneasily' is an anagram indicator.
'pythons'+'sit'='pythonssit'
'pythonssit' is an anagram of 'HYPNOTISTS'.

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I've seen this clue in The Times and The Sunday Times.

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