Carelessly opt to leave Puerto Rico carrying packages, maybe (7)
I believe the answer is:
courier
'carrying packages maybe' is the definition.
I can't tell whether this defines the answer.
'carelessly opt to leave puerto rico' is the wordplay.
'carelessly' indicates anagramming the letters.
'to leave' indicates named letters should be taken away.
'puerto'+'rico'='puertorico'
'puertorico' with 'opt' taken away is 'uerrico'.
'uerrico' with letters rearranged gives 'COURIER'.
Can you help me to learn more?
(Other definitions for courier that I've seen before include "Messenger, runner" , "Delivery messenger" , "Diplomatic messenger" , "Messenger conveying news or document (7)" , "Person delivering a parcel, say, by motorcycle" .)