Crossword Genius

Flood wolf? (8)

Ross

I believe the answer is:

overflow

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'flood' is the first definition.
(synonyms)

'wolf?' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

Can you help me to learn more?

(Other definitions for overflow that I've seen before include "Be excessively full" , "Pipe to remove excess liquid" , "(Outlet for) surplus water" , "Drainage outlet" , "Spillage of excess liquid" .)

I've seen this clue in the Sydney Morning Herald.
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