Corporation taking on human resources drone (5)
I believe the answer is:
thrum
'drone' is the definition.
(I've seen this before)
'corporation taking on human resources' is the wordplay.
'corporation' becomes 'tum' ('corporation' is a humorous term for stomach fat).
'taking on' indicates putting letters inside.
'human resources' becomes 'HR'.
'tum' going around 'hr' is 'THRUM'.
(Other definitions for thrum that I've seen before include "Strum; thread end" , "Rhythmic buzzing sound - fringe left after weaving" , "Play monotonously" , "bit of thread" , "Monotonously repeat" .)