Ricochet blast resounded containing energy (9)
I believe the answer is:
boomerang
'ricochet' is the definition.
(thesaurus)
'blast resounded containing energy' is the wordplay.
'blast' becomes 'boom' ('boom' can be a synonym of 'blast').
'resounded' becomes 'rang' ('ring' can be a synonym of 'resound').
'containing' is an insertion indicator.
'energy' becomes 'e' (physics symbol as in E=mc2).
'boom'+'rang'='boomrang'
'boomrang' enclosing 'e' is 'BOOMERANG'.
(Other definitions for boomerang that I've seen before include ""It keeps coming back"" , "Recoil from" , "Primitive weapon" , "Self-returning missile" , "Australian throwing stick" .)