Left food out, suitable for ducks (5)

I believe the answer is:

flood

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'left food out suitable for ducks' is the definition.
I can't judge whether this definition defines the answer.

'left food out' is the wordplay.
'left' becomes 'L' (common abbreviation).
'out' means one lot of letters goes inside another.
'l' put inside 'food' is 'FLOOD'.

Can you help me to learn more?

(Other definitions for flood that I've seen before include "Deluge" , "Spate" , "Oversupply" , "swamp" , "Overwhelming amount" .)

I've seen this clue in the Evening Standard.

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