Drone from America is found on the ground (5)
I believe the answer is:
humus
'the ground' is the definition.
(humus is a kind of ground)
'drone from america is found on' is the wordplay.
'drone' becomes 'hum' (I've seen this before).
'from america' becomes 'us'.
'is found on' means one lot of letters go next to another.
'hum'+'us'='HUMUS'
(Other definitions for humus that I've seen before include "Decaying organic material" , "garden material" , "Decomposed organic matter in soil" , "Organic "fertiliser"" , "Fertilising agent" .)