Drone linked to superpower remains on the ground (5)
I believe the answer is:
humus
'remains on the ground' is the definition.
'humus' can be an answer for 'ground' (humus is a kind of ground). I'm not certain of the 'remains on the' bit.
'drone linked to superpower' is the wordplay.
'drone' becomes 'hum' (drone can mean to make a humming sound).
'linked to' says to put letters next to each other.
'superpower' becomes 'US' (the United States is a global superpower).
'hum'+'us'='HUMUS'
Can you help me to learn more?
(Other definitions for humus that I've seen before include "Organic component of soil" , "Organic matter in topsoil" , "Rich organic material from dead leaves, plants etc" , "Soil's organic component" , "Decomposed organic matter in soil" .)