Even the top man can make a hash (4)

I believe the answer is:

shah

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'even the top man' is the definition.
I can't judge whether this definition defines the answer.

'make a hash' is the wordplay.
'make' indicates anagramming the letters.
'hash' is an anagram of 'SHAH'.

'can' is the link.

Can you help me to learn more?

(Other definitions for shah that I've seen before include "Emperor of Iran" , "Persian king" , "Old king" , "Former hereditary monarch of Iran" , "Iranian emperor" .)

I've seen this clue in the Evening Standard.

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