Joy has broken toenail (7)
I believe the answer is:
elation
'joy' is the definition.
(I know that elation is a type of joy)
'broken toenail' is the wordplay.
'broken' is an anagram indicator.
'toenail' with letters rearranged gives 'ELATION'.
'has' is the link.
(Other definitions for elation that I've seen before include "'High spirits, exhilaration (7)'" , "State of pleasure about toe-nail" , "Transport" , "Euphoria of toenail" , "Feeling of delight, joy" .)