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Maybe sledgehammer learner deployed in stunt to crack Brazil nut? Me joshing (5,10)

Ross

I believe the answer is:

blunt instrument

I'm a little stuck... Click here to teach me more about this clue!

'maybe sledgehammer' is the definition.
The definition suggests a singular noun which matches the answer.

'learner deployed in stunt to crack brazil nut? me joshing' is the wordplay.
I cannot really understand how this works, but
'learner' could be 'l' and 'l' is present in the answer.
'in' is found in the answer.
an anagram of 'stunt' is 'untst' which is located in the left over letters.
'brazil' could be 'br' and 'br' is present in the leftover letters.
'nut?' could be 'en' ('nut' is printers' slang for an en space) and 'en' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for blunt instrument that I've seen before include "club, say" , "weapon, perhaps" , "club, perhaps" .)

I've seen this clue in The Independent.
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