Tot its assortment, mind (7)

I believe the answer is:

babysit

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

'tot its assortment' is the wordplay.
'tot' becomes 'baby' (I can't explain this - if you can you should believe this answer much more).
'assortment' indicates anagramming the letters.
'its' with letters rearranged gives 'sit'.
'baby'+'sit'='BABYSIT'

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(Other definitions for babysit that I've seen before include "Tend to kid" , "Look after children temporarily" , "Take charge to allow parents to go out" , "Mind" , "Supervise in loco parentis" .)

I've seen this clue in The Daily Express.

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