A general mess of mud is something to attend to (7)

I believe the answer is:

agendum

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'something to attend to' is the definition.
I can't judge whether this defines the answer.

'a general mess of mud' is the wordplay.
'general' becomes 'gen'.
'mess of' indicates anagramming the letters.
'mud' with letters rearranged gives 'dum'.
'a'+'gen'+'dum'='AGENDUM'

'is' acts as a link.

Can you help me to learn more?

(Another definition for agendum that I've seen is " item for meeting -".)

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