It's said to be polite (6)
I believe the answer is:
please
'it's said to be polite' is the definition.
I can't judge whether this defines the answer.
'it's said to be polite' is the wordplay.
'it's' becomes 'e's' ('e' can mean 'electronic' which is similar to 'IT').
'said' indicates a 'sounds like' (homophone) clue.
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'be polite' becomes 'pl' (I can't justify this - if you can you should believe this answer much more).
'es' is a homophone of 'ease'.
'ease' after 'pl' is 'PLEASE'.
Can you help me to learn more?
(Other definitions for please that I've seen before include "Satisfy aesthetically" , "Satisfy or gratify" , "Cause (someone) to feel satisfied" , "Gratify as by a sleep" , "Satisfy while asleep" .)