Sorry, it’s slow, four runs? Out (9)
I believe the answer is:
sorrowful
'sorry' is the definition.
(thesaurus)
'slow four runs? out' is the wordplay.
'runs?' becomes 'r' (cricket abbreviation).
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'slow'+'four'+'r'='slowfourr'
'slowfourr' anagrammed gives 'SORROWFUL'.
'it's' is the link.
(Other definitions for sorrowful that I've seen before include "Unhappy" , "Grief-stricken" , "Sad, dejected" , "Miserable" , "Melancholy" .)