Following closely to this, I run up shattered (2,3,7)
I believe the answer is:
in hot pursuit
'following closely' is the definition.
(I've seen this before)
'to this i run up shattered' is the wordplay.
'shattered' indicates anagramming the letters.
'to'+'this'+'i'+'run'+'up'='tothisirunup'
'tothisirunup' anagrammed gives 'IN HOT PURSUIT'.
(Other definitions for in hot pursuit that I've seen before include "Closely chasing" , "Following closely" , "Chasing at full speed" .)