Use explosive to finish the job, finally (5)

I believe the answer is:

blast

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'use explosive' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'finish the job finally' is the wordplay.
'finish' says to take the final letters.
'finally' becomes 'last' (synonyms).
The final letter of 'job' is 'b'.
'b'+'last'='BLAST'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for blast that I've seen before include "Explosion - mild oath" , "Loud noise from a horn" , "Strong gust of air" , "slate" , "Damn - explosion" .)

I've seen this clue in the Evening Standard.

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