Superficial swine passing round room (7)
I believe the answer is:
shallow
'superficial' is the definition.
(similar in meaning)
'swine passing round room' is the wordplay.
'swine' becomes 'sow' (sow is a kind of swine).
'passing round' is an insertion indicator.
'room' becomes 'hall' (hall is a kind of room).
'sow' placed around 'hall' is 'SHALLOW'.
(Other definitions for shallow that I've seen before include "Of waters, not deep" , "Of no great depth" , "justice" , "Insincere" , "Trivial" .)