Crossword Genius

One who could have worked with Reed on The House of Usher ? (8)

Ross

I believe the answer is:

thatcher

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'one who could have worked with reed on the house of usher ?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'one who could have' is the wordplay.
'one who' becomes 'that'.
'could have' becomes 'cher' (I can't justify this - if you can you should give a lot more credence to this answer).
'that'+'cher'='THATCHER'

Can you help me to learn more?

(Other definitions for thatcher that I've seen before include "Baroness --, former PM" , "man on roof" , "Former prime minister" , "Member of 7 [ORDER OF MERIT]" , "Roof-working prime minister" .)

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