Grow weary of dear Juliet, broken without Romeo (4)
I believe the answer is:
jade
'grow weary' is the definition.
(synonyms)
'dear juliet broken without romeo' is the wordplay.
I cannot really understand how this works, but
'juliet' could be 'j' (phonetic alphabet: alpha, bravo, charlie etc.) and 'j' is found within the answer.
The remaining letters 'ade' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'of' is the link.
Can you help me to learn more?
(Other definitions for jade that I've seen before include "Semiprecious stone - exhaust" , "Worthless horse" , "Green ornamental stone" , "Semi-precious gemstone -- tired old horse" , "weary" .)