Queen follows attendants in coach (7)
I believe the answer is:
trainer
'coach' is the definition.
(as in a sports coach)
'queen follows attendants' is the wordplay.
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'follows' says to put letters next to each other.
'attendants' becomes 'train' (train can mean attendants following a royal).
'er' after 'train' is 'TRAINER'.
'in' is the link.
(Other definitions for trainer that I've seen before include "As a P.E. instructor" , "Running shoe" , "Sports/casual shoe" , "Machine that simulates the conditions of flying a plane" , "Person in charge of stable" .)