Work together to solve old clue (7)

I believe the answer is:

collude

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

'work together to solve old clue' is the definition.
I can't tell whether this defines the answer.

'to solve old clue' is the wordplay.
'to solve' indicates an anagram (I've seen 'solved' mean this (the anagram must be solved)).
'old'+'clue'='oldclue'
'oldclue' anagrammed gives 'COLLUDE'.

Can you help me to learn more?

(Other definitions for collude that I've seen before include "Conspire to defraud" , "Come to a secret and devious understanding" , "Agree in secret" , "Conspire fraudulently" , "Plot secretly with someone to commit a crime" .)

I've seen this clue in The Irish Times.

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.