Crossword Genius

Kitty has spread fertiliser (6)

Ross

I believe the answer is:

potash

'fertiliser' is the definition.
(I know that potash is a type of fertiliser)

'kitty has spread' is the wordplay.
'kitty' becomes 'pot' (both can mean a shared fund).
'spread' indicates an anagram.
'has' with letters rearranged gives 'ash'.
'pot'+'ash'='POTASH'

(Other definitions for potash that I've seen before include "Potassium carbonate or hydroxide" , "Potassium compound used as fertiliser" , "field dressing" , "Pathos (anag)" , "Type of fertiliser" .)

I've seen this clue in The Daily Express.
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