Pop called each day within confines of office (9)
I believe the answer is:
orangeade
'pop' is the definition.
(I've seen this before)
'called each day within confines of office' is the wordplay.
'called' becomes 'rang' (called on the phone).
'each' becomes 'ea' (abbreviation).
'day' becomes 'd' (abbreviation for day).
'within' is an insertion indicator.
'confines of' means to remove the middle letters (only the edge letters that confine the others).
'office' with its middle taken out is 'oe'.
'rang'+'ea'+'d'='rangead'
'rangead' inserted into 'oe' is 'ORANGEADE'.
(Other definitions for orangeade that I've seen before include "Pop" , "Bubbly drink" , "Soft citrus drink" , "Fruity drink" , "Fruit drink" .)