Rare shock where Charlie enters (6)
I believe the answer is:
scarce
'rare' is the definition.
(similar in meaning)
'shock where charlie enters' is the wordplay.
'shock where' becomes 'scare' (I am not sure about this - if you are sure you should believe this answer much more).
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'enters' is an insertion indicator.
'scare' placed around 'c' is 'SCARCE'.
Can you help me to learn more?
(Other definitions for scarce that I've seen before include "Not often come across" , "Not enough to meet demand" , "Rare shock Conservative getting in" , "exceptional" , "Hardly" .)