Crossword Genius

Plan best left forgotten (4)

Ross

I believe the answer is:

idea

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

'plan' is the definition.
(thesaurus)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for idea that I've seen before include "Mental impression" , "Brainwave" , "Creative spark" , "Notion, concept" , "Thought, conception" .)

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app