I let the tots play about with something dangerous (8)

I believe the answer is:

stiletto

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'with something dangerous' is the definition.
I can't judge whether this defines the answer.

'i let the tots play' is the wordplay.
'play' indicates an anagram.
'i'+'let'+'tots'='ilettots'
'ilettots' with letters rearranged gives 'STILETTO'.

'about' is the link.

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(Other definitions for stiletto that I've seen before include "Tapering dagger" , "A short knife, dagger or heel" , "Stabbing dagger or high heel" , "Narrow-bladed dagger" , "Slender-bladed dagger - heel" .)

I've seen this clue in the Evening Standard.

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