Drone from hard right in corporation (5)
I believe the answer is:
thrum
'drone' is the definition.
(I've seen this before)
'hard right in corporation' is the wordplay.
'hard' becomes 'h' (abbreviation used in pencil classifications).
'right' becomes 'r' (common abbreviation).
'in' indicates putting letters inside.
'corporation' becomes 'tum' ('corporation' is a humorous term for stomach fat).
'h'+'r'='hr'
'hr' put inside 'tum' is 'THRUM'.
'from' acts as a link.
(Other definitions for thrum that I've seen before include "tattoo" , "Play idly" , "Drum with fingers - bits of coarse yarn" , "Repetitive sound" , "something fibrous" .)