Heard you are invested in escort agency (6)
I believe the answer is:
bureau
'agency' is the definition.
(synonyms)
'heard you are invested in escort' is the wordplay.
'heard you are' becomes 'ur' (I can't explain this - if you can you should believe this answer much more).
'invested in' indicates putting letters inside.
'escort' becomes 'beau' (a beau is a male partner - an escort to events).
'ur' put into 'beau' is 'BUREAU'.
(Other definitions for bureau that I've seen before include "Room" , "Wtiting desk" , "Foreign office" , "Government department, agency" , "The ------, familiar name of the FBI" .)