Transport once for drama instructor (10)
I believe the answer is:
stagecoach
'transport' is the definition.
(stagecoach is a kind of transport)
'for drama instructor' is the wordplay.
'for drama' becomes 'stage' (I can't explain this - if you can you should believe this answer much more).
'instructor' becomes 'coach' (coach is a kind of instructor).
'stage'+'coach'='STAGECOACH'
'once' acts as a link.
Can you help me to learn more?
(Other definitions for stagecoach that I've seen before include "Diligence" , "One gets around stops" , "Travelling" , "Great Western" , "Horse-drawn carriage" .)