Emperor taking drink back in chariot (6)
I believe the answer is:
caesar
'emperor' is the definition.
(title used by Roman emperors)
'taking drink back in chariot' is the wordplay.
'taking drink' becomes 'sea' ('the drink' can informally mean the sea. I am not sure about the 'taking' bit.).
'back' shows that the letters should be reversed in order.
'in' is an insertion indicator.
'chariot' becomes 'car' (I've seen this in other clues).
'sea' backwards is 'aes'.
'aes' inserted inside 'car' is 'CAESAR'.
Can you help me to learn more?
(Other definitions for caesar that I've seen before include "extraction operation" , "US comedian" , "Eg, Augustus, Julius" , "See 12" , "leader who acts like a dictator" .)