Broken toenail brings great joy! (7)
I believe the answer is:
elation
'great joy' is the definition.
(I've seen this before)
'broken toenail' is the wordplay.
'broken' is an anagram indicator.
'toenail' with letters rearranged gives 'ELATION'.
'brings' is the link.
(Other definitions for elation that I've seen before include "State of being delighted or proud" , "Feeling of delight or pride" , "Transport" , "State of pleasure about toe-nail" , "Exaltation" .)