Jumper found in side café (7)
I believe the answer is:
tearoom
'cafe' is the definition.
(tearoom is a type of cafe)
'jumper found in side' is the wordplay.
'jumper' becomes 'roo' (short for kangaroo, something which jumps).
'found in' means one lot of letters goes inside another.
'side' becomes 'team' (a side is a sporting team).
'roo' put inside 'team' is 'TEAROOM'.
(Other definitions for tearoom that I've seen before include "Where light refreshments are served" , "24" , "Cafeteria" , "Small restaurant" , "Restaurant for light meals" .)