Surprised to see one imprisoned in Birmingham outhouse (10)
I believe the answer is:
astonished
'surprised' is the definition.
(similar in meaning)
'one imprisoned in birmingham outhouse' is the wordplay.
'one' becomes 'i' (Roman numeral).
'imprisoned in' means one lot of letters goes inside another.
'birmingham' becomes 'aston' (I can't explain this - if you can you should give a lot more credence to this answer).
'outhouse' becomes 'shed' (a shed is an outside building).
'aston'+'shed'='astonshed'
'i' inserted inside 'astonshed' is 'ASTONISHED'.
'to see' is the link.
Can you help me to learn more?
(Other definitions for astonished that I've seen before include "Staggered" , "Sad one, this (anag)" , "dumbfounded" , "Confounded" , "Amazed" .)