Angel leaving first century cemetery (9)
I believe the answer is:
arlington
'cemetery' is the definition.
(I've seen this before)
'angel leaving first century' is the wordplay.
'angel leaving' becomes 'arling' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'first' means one lot of letters go next to another.
'century' becomes 'ton' (both can mean one hundred of something).
'arling'+'ton'='ARLINGTON'
Can you help me to learn more?
(Other definitions for arlington that I've seen before include "US National Cemetery site" , "Military cemetery" , "American county" , "in Texas" , "American cemetery" .)