One under coach protected by astute engine-driver (5)
I believe the answer is:
tutee
'one under coach' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'protected by astute engine-driver' is the wordplay.
'protected by' indicates a hidden word.
'TUTEE' can be found hidden inside 'astute engine driver'.
Can you help me to learn more?
(Other definitions for tutee that I've seen before include "One learns from a personal teacher" , "Student, pupil" .)