Turn up with a worker as escort (9)
I believe the answer is:
attendant
'escort' is the definition.
(I've seen this before)
'turn up with a worker' is the wordplay.
'turn up' becomes 'attend' (I've seen this before).
'with' means one lot of letters go next to another.
'a worker' becomes 'ant' (worker is a type of ant).
'attend'+'ant'='ATTENDANT'
'as' acts as a link.
(Other definitions for attendant that I've seen before include "waiter" , "One present to guide, help" , "guard" , "Related" , "S/he sees to the needs of others" .)