Striking out, toiler in boat capsizes (12)
I believe the answer is:
obliteration
'striking' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'toiler in boat capsizes' is the wordplay.
'capsizes' indicates anagramming the letters (I've seen 'capsized' mean this).
'toiler'+'in'+'boat'='toilerinboat'
'toilerinboat' anagrammed gives 'OBLITERATION'.
'out' is the link.
Can you help me to learn more?
(Other definitions for obliteration that I've seen before include "Erasure" , "complete effacement" , "loss" , "Utter destruction" .)