Yet another broadcast about soil conditioner (6)
I believe the answer is:
repeat
'yet another broadcast' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?
'about soil conditioner' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'soil conditioner' becomes 'peat' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
're'+'peat'='REPEAT'
Can you help me to learn more?
(Other definitions for repeat that I've seen before include "Say again, echo" , "Parrot" , "Say again, or belch (6" , "Further airing" , "Say or perform again" .)