A piece to start eating? (4)

I believe the answer is:

bite

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This could be a double definition.

'a piece' is the first definition.
(thesaurus)

'start eating?' is the second definition.
'bite' can be an answer for 'eating?' (bite is a kind of eating). I am not certain of the 'start' bit.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for bite that I've seen before include "Mouthful" , "Small amount of food" , "Light meal" , "Pungency" , "Cut with the teeth" .)

I've seen this clue in the Evening Standard.

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