Threw mottled core away and choked (9)
I believe the answer is:
throttled
'choked' is the definition.
('throttle' can be a synonym of 'choke')
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for throttled that I've seen before include "Suppressed" , "Choked" , "Strangled manually" .)