Growing sources of new lamps (5)
I believe the answer is:
palms
'growing sources' is the definition.
The definition and answer can be both related to communication as well as being plural nouns.
Perhaps you can see a link between them that I can't see?
'new lamps' is the wordplay.
'new' indicates an anagram.
'lamps' anagrammed gives 'PALMS'.
'of' is the link.
Can you help me to learn more?
(Other definitions for palms that I've seen before include "Large, tropical trees" , "Hand parts or tropical trees" .)