After bungling order, he'd be on a plank (8)

I believe the answer is:

bonehead

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'after bungling order he'd be on a plank' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'after bungling order he'd be on a plank' is the wordplay.
'he'd be on a' anagrams to 'BONEHEAD'.
But, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for bonehead that I've seen before include "dope" , "Fool" , "Stupid person with ossified brain" , "Numbskull" , "stupid leader" .)

I've seen this clue in The Independent.

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