Phosphorus is put on many bits of land (5)
I believe the answer is:
plots
'bits of land' is the definition.
The definition and answer can be both related to communication as well as being plural nouns.
Perhaps you can see an association between them that I don't see?
'phosphorus is put on many' is the wordplay.
'phosphorus' becomes 'P' (P is the chemical symbol for phosphorus).
'is put on' says to put letters next to each other.
'many' becomes 'lots' (lots of something).
'p'+'lots'='PLOTS'
Can you help me to learn more?
(Other definitions for plots that I've seen before include "Schemes" , "Stories in novels or plays" , "Plans" , "Conspires" .)