Neat sort of room? (4)
I believe the answer is:
ante
'room?' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'neat sort' is the wordplay.
'sort' indicates anagramming the letters.
'neat' with letters rearranged gives 'ANTE'.
'of' is the link.
Can you help me to learn more?
(Other definitions for ante that I've seen before include "expected from stake" , "Poker pot starter" , "advance payment" , "Opening bet" , "Stake, bet" .)