Coach transport (5)
I believe the answer is:
train
I believe this clue is a double definition.
'coach' is the first definition.
(both can mean to instruct a sportsperson)
'transport' is the second definition.
(train is a kind of transport)
(Other definitions for train that I've seen before include "guide" , "Prepare for public transport?" , "Teach; series of gears" , "Exercise in preparation for some event" , "Aim < to prepare < railway carriages" .)