NYPD case to get resolved having been shortened (10)
I believe the answer is:
syncopated
'having been shortened' is the definition.
'nypd case to get resolved' is the wordplay.
'get resolved' is an anagram indicator.
'nypd'+'case'+'to'='nypdcaseto'
'nypdcaseto' anagrammed gives 'SYNCOPATED'.
(Other definitions for syncopated that I've seen before include "involving a time of rhythmic variety" , "Off the beat" .)