21 across
Coach
tyres
unable
to
operate
reliably
at
the
beginning
(5)
Coach tyres unable to operate reliably at the beginning (5)
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The definition is at the beginning of the clue.
How the clue works
The definition is Coach, meaning a teacher or tutor. Then "at the beginning" tells you to take the first letters of Tyres Unable To Operate Reliably, which gives you the answer neatly spelled out.