Threw away black stone I'd damaged (10)
I believe the answer is:
jettisoned
'threw away' is the definition.
(jettisoning is a kind of throwing away)
'black stone i'd damaged' is the wordplay.
'black' becomes 'jet' ('jet' can be similar in meaning to 'black').
'damaged' indicates an anagram.
'stone'+'id'='stoneid'
'stoneid' anagrammed gives 'tisoned'.
'jet'+'tisoned'='JETTISONED'
(Other definitions for jettisoned that I've seen before include "Threw away" , "dumped" , "Thrown overboard" , "thrown out of plane" , "Ditched" .)