Ousting everyone, beat Dean maybe (6)
I believe the answer is:
forest
'ousting' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for forest that I've seen before include "Thief (rhyming slang)" , "Thick growth of trees" , "Land covered with trees" , "Wooded region" , "See 15" .)