Small marsupial in side of refreshment place (3,4)
I believe the answer is:
tea room
'refreshment place' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'small marsupial in side' is the wordplay.
'small marsupial' becomes 'roo' (short for kangaroo; 'small' asks for a short form).
'in' is an insertion indicator.
'side' becomes 'team' (a side is a sporting team).
'roo' placed inside 'team' is 'TEA-ROOM'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for tea room that I've seen before include "Place in which a cuppa is served" , "Place for light refreshments" , "Where light refreshments are served" , "Small restaurant or cafe" .)