A stimulant, snappy in a handy sort of way (6)

I believe the answer is:

fillip

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'a stimulant' is the definition.
(fillip is a kind of stimulant)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for fillip that I've seen before include "Incitement" , "Get a boost" , "19, which sounds like a boy's name" , "Stimulus, quick boost" , "Encouraging boost" .)

I've seen this clue in the Evening Standard.

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