In office, you are texting boyfriend to come round (6)
I believe the answer is:
bureau
'in office' is the definition.
'bureau' can be an answer for 'office' (synonyms). I am not sure about the 'in' bit.
'you are texting boyfriend to come round' is the wordplay.
'you are texting' becomes 'ur' (abbreviation for 'you are' when texting).
'boyfriend' becomes 'beau' (synonyms).
'to come round' is an insertion indicator.
'ur' put into 'beau' is 'BUREAU'.
(Other definitions for bureau that I've seen before include "Piece of furniture with drawers" , "Government department, agency" , "Writing desk with drawers" , "Agency - writing desk" , "Ancient chipped flint" .)