One using free ticket passed on by teacher (8)
I believe the answer is:
deadhead
'one using free ticket' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'passed on by teacher' is the wordplay.
'passed on' becomes 'dead' (I've seen this before).
'by' means one lot of letters go next to another.
'teacher' becomes 'head'.
'dead'+'head'='DEADHEAD'
Can you help me to learn more?
(Other definitions for deadhead that I've seen before include "bore" , "archetypal hippy" , "To carry out garden task in summer" , "Trim faded bloom" , "Treat rambler, perhaps" .)