Crossword Genius

Stew has her way of using leftovers (6)

Ross

I believe the answer is:

rehash

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'way of using leftovers' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'stew has her' is the wordplay.
'stew' is an anagram indicator.
'has'+'her'='hasher'
'hasher' with letters rearranged gives 'REHASH'.

Can you help me to learn more?

(Other definitions for rehash that I've seen before include "Rework old material" , "Use old material in a new form" , "Put old material into new form without much change" , "Recycled material" , "Same material, different mix" .)

I've seen this clue in The Globe and Mail and The Guardian.
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