Crossword Genius

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

Ross

I believe the answer is:

agendum

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

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

'a general mess of mud' is the wordplay.
'general' becomes 'gen'.
'mess of' indicates anagramming the letters (I've seen 'mess' mean this).
'mud' anagrammed gives 'dum'.
'a'+'gen'+'dum'='AGENDUM'

'is' is the link.

Can you help me to learn more?

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

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