Decent message about drones, I gathered (12)
I believe the answer is:
considerable
'decent' is the definition.
(thesaurus)
'message about drones i gathered' is the wordplay.
'message' becomes 'cable' (cable is a kind of message**).
'about' is an insertion indicator.
'gathered' is an anagram indicator.
'drones'+'i'='dronesi'
'dronesi' with letters rearranged gives 'onsider'.
'cable' going around 'onsider' is 'CONSIDERABLE'.
(Other definitions for considerable that I've seen before include "worthy of attention" , "Fairly large or numerous" , "of some importance" , "Notably large" , "Tidy" .)