Untidy room used for a guest at the tea party (8)
I believe the answer is:
dormouse
'a guest at the tea party' is the definition.
I can't tell whether this definition defines the answer.
'untidy room used' is the wordplay.
'untidy' indicates anagramming the letters.
'room'+'used'='roomused'
'roomused' with letters rearranged gives 'DORMOUSE'.
'for' is the link.
Can you help me to learn more?
(Other definitions for dormouse that I've seen before include "sleepy little creature" , "Alice tea party creature" , "Small British rodent" , "Animal" , "Small rodent that hibernates in winter" .)