Sells beam off, above reproach (9)

I believe the answer is:

blameless

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'sells beam off above reproach' is the definition.
I can't tell whether this definition defines the answer.

'sells beam off' is the wordplay.
'off' indicates anagramming the letters.
'sells'+'beam'='sellsbeam'
'sellsbeam' anagrammed gives 'BLAMELESS'.

Can you help me to learn more?

(Other definitions for blameless that I've seen before include "Irreproachable" , "Without culpability, innocent" .)

I've seen this clue in The Mirror.

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