Tower inmate confused about origin of ravens (7)
I believe the answer is:
minaret
'tower' is the definition.
(I know that minaret is a type of tower)
'inmate confused about origin of ravens' is the wordplay.
'confused' indicates an anagram.
'about' indicates putting letters inside.
'origin of' suggests taking the first letters.
The initial letter of 'ravens' is 'r'.
'inmate' is an anagram of 'minaet'.
'minaet' going around 'r' is 'MINARET'.
(Other definitions for minaret that I've seen before include "tower in Istanbul, say" , "Building" , "Slender mosque tower" , "religious tower" , "Tower attached to mosque" .)