Stone tossed out, squire (9)
I believe the answer is:
turquoise
'stone' is the definition.
(I have seen 'Precious stone ' mean 'turquoise' so perhaps 'stone' could also mean 'turquoise')
'tossed out squire' is the wordplay.
'tossed' indicates anagramming the letters.
'out'+'squire'='outsquire'
'outsquire' with letters rearranged gives 'TURQUOISE'.
(Other definitions for turquoise that I've seen before include "Precious stone" , "Bluey-green" , "Blue-green" , "Greenish-blue gem" , "Greenish-blue stone" .)