Session quite well placed (7,6)
I believe the answer is:
sitting pretty
'well placed' is the definition.
(I've seen this in another clue)
'session quite' is the wordplay.
'session' becomes 'sitting' (sitting is a kind of session).
'quite' becomes 'pretty' (synonyms).
'sitting'+'pretty'='SITTING PRETTY'
(Other definitions for sitting pretty that I've seen before include "Well placed" , "acting and looking like model?" , "advantageously positioned" , "rich?" , "Financially secure" .)