Rubbish fine, picked up by drone (5)
I believe the answer is:
hokum
'rubbish' is the definition.
(I've seen this before)
'fine picked up by drone' is the wordplay.
'fine' becomes 'ok' (synonyms).
'picked up by' means one lot of letters goes inside another (some letters collected or picked up by others).
'drone' becomes 'hum' (I've seen this before).
'ok' put into 'hum' is 'HOKUM'.
(Other definitions for hokum that I've seen before include "Claptrap" , "Rubbish" , "Meaninglessness" , "gammon" , "Be extremely good (at activity)" .)