English architect tries to sell space, after suffering reversal (9)
I believe the answer is:
hawksmoor
'english architect tries to' is the definition.
I can't judge whether this defines the answer.
'sell space after suffering reversal' is the wordplay.
'sell' becomes 'hawk' (hawking is a kind of selling).
'space' becomes 'room' (enough space or room to do something).
'after' becomes 's' (I am not sure about this - if you are sure you should believe this answer much more).
'suffering reversal' says the letters should be written in reverse.
'room'+'s'='rooms'
'rooms' written backwards gives 'smoor'.
'hawk'+'smoor'='HAWKSMOOR'
Can you help me to learn more?
(Another definition for hawksmoor that I've seen is " Architect".)