Means to alter headings (5)
I believe the answer is:
names
'headings' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Maybe they are linked in a way I don't understand?
'means to alter' is the wordplay.
'to alter' indicates an anagram.
'means' anagrammed gives 'NAMES'.
Can you help me to learn more?
(Other definitions for names that I've seen before include "People and things are known by them" , "celebrities" , "Appellations or identifiers" , "Titles" , "Heroes" .)