Operator of ferry boarded by empty Porsche or Escort (8)
I believe the answer is:
chaperon
'escort' is the definition.
(I know that chaperon is a more specific form of escort)
'operator of ferry boarded by empty porsche' is the wordplay.
'operator of ferry' becomes 'charon' (I can't explain this - if you can you should give a lot more credence to this answer).
'boarded by' indicates putting letters inside (I've seen this in other clues).
'empty' means to remove the middle letters.
'porsche' with its centre removed is 'pe'.
'charon' going around 'pe' is 'CHAPERON'.
'or' is the link.
Can you help me to learn more?
(Other definitions for chaperon that I've seen before include "One accompanies to supervise" , "Girl minder from Cape Horn" , "One who accompanies and supervises" , "Car-phone (anag.)" , "Guardian" .)