It's rot! Solve the problem! (4,2,3)

I believe the answer is:

sort it out

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

'it's rot solve the problem' is the definition.
I know nothing about this answer so I can't judge whether this works.

'it's rot solve the problem' is the wordplay.
'solve' indicates an anagram (I've seen 'solved' mean this (the anagram must be solved)).
'the problem' becomes 'out' (I can't explain this - if you can you should believe this answer much more).
'its'+'rot'='itsrot'
'itsrot' anagrammed gives 'sortit'.
'sortit'+'out'='SORT IT OUT'

Can you help me to learn more?

(Another definition for sort it out that I've seen is " Pull yourself together - get organised!".)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.