Begin small pastry dish (5)

I believe the answer is:

start

'begin' is the definition.
(I know that begin can be written as start)

'small pastry dish' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'pastry dish' becomes 'tart' (type of pastry product).
's'+'tart'='START'

(Other definitions for start that I've seen before include "Begin with sudden movement of surprise" , "Begin; flinch" , "Begin to recoil?" , "lead" , "Beginning" .)

I've seen this clue in The Guardian.

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