Teacher being in bar inside dive (10)
I believe the answer is:
headmaster
'teacher' is the definition.
(I know that headmaster is a type of teacher)
'being in bar inside dive' is the wordplay.
'being in' becomes 'mas' (I can't explain this - if you can you should give a lot more credence to this answer).
'bar' becomes 't' (T-bar is a part of a ski lift).
'inside' indicates putting letters inside.
'dive' becomes 'header' (a header is a dive forwards).
'mas'+'t'='mast'
'mast' placed into 'header' is 'HEADMASTER'.
Can you help me to learn more?
(Other definitions for headmaster that I've seen before include "Top (male) teacher" , "Principal" , "School manager" .)