Pam rang excitedly — “This includes every letter!” (7)
I believe the answer is:
pangram
'this includes every letter' is the definition.
(text containing all letters of the alphabet )
'pam rang excitedly' is the wordplay.
'excitedly' indicates anagramming the letters.
'pam'+'rang'='pamrang'
'pamrang' is an anagram of 'PANGRAM'.
(Other definitions for pangram that I've seen before include "Sentence containing all twenty-six letters" , ""The quick brown fox ..." for example" , "special literary construction" , "Text using whole alphabet" .)