Roughly broken horse in carved jade (6)
I believe the answer is:
jagged
'roughly broken' is the definition.
'jagged' can be an answer for 'broken' (thesaurus). I'm not sure about the 'roughly' bit.
'horse in carved jade' is the wordplay.
'horse' becomes 'gg' (geegee or GG is a childish term for a horse).
'in' means one lot of letters goes inside another.
'carved' indicates an anagram.
'jade' with letters rearranged gives 'jaed'.
'gg' put inside 'jaed' is 'JAGGED'.
Can you help me to learn more?
(Other definitions for jagged that I've seen before include "Notched; rough-edged; uneven" , "Having uneven edge, knife or rock" , "Sharp-edged" , "Having an irregularly notched or toothed edge" , "With a sharply uneven edge" .)