To shatter central targets is terrific! (5)
I believe the answer is:
great
'terrific' is the definition.
(thesaurus)
'to shatter central targets' is the wordplay.
'to shatter' is an anagram indicator (I've seen this in other clues).
'central' indicates the central letters.
The centre of 'targets' is 'arget'.
'arget' anagrammed gives 'GREAT'.
'is' is the link.
(Other definitions for great that I've seen before include "Chief - weighty" , "Terrific" , "Very large in size, quantity, etc." , "Of considerable size" , "Peter the -, Russ. tsar" .)