It may well receive a lot of plugging (6)
I believe the answer is:
socket
'it' is the definition.
The definition suggests a singular noun which matches the answer.
'may well receive a lot of plugging' is the wordplay.
'may well' becomes 'ck' (I can't justify this - if you can you should believe this answer much more).
'receive' indicates putting letters inside.
'a lot' becomes 'set' ('set' can be a synonym of 'lot').
'of' becomes 'o''.
'plugging' indicates putting letters inside (inserted letters plug up a gap in the word).
'ck' put into 'set' is 'scket'.
'scket' placed around 'o' is 'SOCKET'.
Can you help me to learn more?
(Other definitions for socket that I've seen before include "Cavity for a plug" , "Electricity point" , "Power point" , "Light bulb holder" , "Counterpart to a plug" .)