Handy trick, perhaps, though said to be trifling (7)

I believe the answer is:

sleight

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'handy trick' is the definition.
'sleight' can be an answer for 'trick' (I've seen this before). I'm unsure of the 'handy' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for sleight that I've seen before include "It's deceiving to the eye" , "Artful trick" , "distraction?" , "Conjuror uses this" , "Manual dexterity" .)

I've seen this clue in the Evening Standard.

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