Lacking a clear plan, prepare ham or soup (9)

I believe the answer is:

amorphous

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'lacking a clear plan' is the definition.
I can't judge whether this definition defines the answer.

'prepare ham or soup' is the wordplay.
'prepare' indicates anagramming the letters.
'ham'+'or'+'soup'='hamorsoup'
'hamorsoup' with letters rearranged gives 'AMORPHOUS'.

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(Other definitions for amorphous that I've seen before include "badly organised" , "Out of form" , "With no clear shape" , "Without a clearly-defined shape" , "irregular" .)

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