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.
Maybe they are linked in a way I don't understand?
'new lamps' is the wordplay.
'new' indicates an anagram.
'lamps' is an anagram of 'PALMS'.
'of' acts as a 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" .)