Back row reach down somehow (5-4)

I believe the answer is:

crown-head

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'back row' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'reach down somehow' is the wordplay.
'somehow' indicates an anagram.
'reach'+'down'='reachdown'
'reachdown' anagrammed gives 'CROWN-HEAD'.

Can you help me to learn more?

I've seen this clue in The Independent.

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