Soundly bred on plain food (5)

I believe the answer is:

bread

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'plain food' is the definition.
'bread' can be an answer for 'food' (bread is a kind of food). I'm not certain of the 'plain' bit.

'soundly bred' is the wordplay.
'soundly' shows a homophone (sound like).
'bred' is a homophone of 'BREAD'.

'on' acts as a link.

Can you help me to learn more?

(Other definitions for bread that I've seen before include "It may be made from meal" , "Dosh (slang)" , "Food; money (informal)" , "Lolly - basic food" , "Staple diet" .)

I've seen this clue in the Evening Standard.

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