Crouchback for one thrown in road by king (9)
I believe the answer is:
lancaster
'crouchback' is the definition.
I can't tell whether this definition defines the answer.
'one thrown in road by king' is the wordplay.
'one thrown' becomes 'cast' (I've seen this before).
'in' means one lot of letters goes inside another.
'road' becomes 'lane' (a lane is a narrow road).
'by king' becomes 'r' (abbreviation of Latin rex. I am not sure about the 'by' bit.).
'cast' placed within 'lane' is 'lancaste'.
'lancaste'+'r'='LANCASTER'
'for' is the link.
Can you help me to learn more?
(Other definitions for lancaster that I've seen before include "John of Gaunt?" , "He appeared in many films" , "old house" , "county town" , "City of the red rose" .)