Shabby sort of dagger (6)
I believe the answer is:
ragged
'shabby' is the definition.
(synonyms)
'sort of dagger' is the wordplay.
'sort of' indicates anagramming the letters.
'dagger' anagrammed gives 'RAGGED'.
(Other definitions for ragged that I've seen before include "Unkempt" , "Poorly clothed; with rough edges" , "Wearing torn clothes or lacking smoothness" , "taunted" , "Torn or frayed, or lacking finish" .)