Certainly not many bones shattered (2,2,5)
I believe the answer is:
by no means
'certainly not' is the definition.
(I've seen this before)
'many bones shattered' is the wordplay.
'shattered' indicates an anagram.
'many'+'bones'='manybones'
'manybones' is an anagram of 'BY NO MEANS'.
(Other definitions for by no means that I've seen before include "Definitely not" , "Forbids" , "Certainly not, not in any way" , "Without using any method" , "Certainly not, perish the thought" .)