What could become a son's lavish feed? (6,3,6)

I believe the answer is:

loaves and fishes

'what' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'become a son's lavish feed?' is the wordplay.
'become' indicates an anagram.
'a'+'sons'+'lavish'+'feed'='asonslavishfeed'
'asonslavishfeed' anagrammed gives 'LOAVES AND FISHES'.

'could' acts as a link.

I've seen this clue in The Guardian.

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