Is such bread a repast in itself? (9)

I believe the answer is:

wholemeal

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'itself?' is the definition.
I can't judge whether this definition defines the answer.

'is such bread a repast' is the wordplay.
'is such bread' becomes 'whole' (I am not sure about this - if you are sure you should believe this answer much more).
'a repast' becomes 'meal' (synonyms).
'whole'+'meal'='WHOLEMEAL'

'in' is the link.

Can you help me to learn more?

(Other definitions for wholemeal that I've seen before include "Brown possibly" , "Type of bread" , "kind of bread" , "Type of flour" , "Like bread" .)

I've seen this clue in the Evening Standard.

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