Crossword Genius

Boiler fixed by unknown bloke once offering staff work? (7)

Ross

I believe the answer is:

berlioz

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

'staff work?' is the definition.
The definition suggests a singular noun which matches the answer.

'boiler fixed by unknown bloke once' is the wordplay.
I cannot quite see how this works, but
an anagram of 'boiler' is 'berlio' which is located in the answer.
'unknown' could be 'z' (algebra) and 'z' is present in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

'offering' acts as a link.

Can you help me to learn more?

(Other definitions for berlioz that I've seen before include "Trojans composer" , "French composer of "Symphonie fantastique"" , "French composer, 1803-69" , "French composer,1803-69" , "Barman" .)

I've seen this clue in The Guardian.
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