A queen filling cups behind vessel (8)
I believe the answer is:
canberra
'a queen filling cups behind vessel' is the definition.
I can't judge whether this definition defines the answer.
'queen filling cups behind vessel' is the wordplay.
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'filling' indicates putting letters inside.
'cups' becomes 'bra' (as in the two cups of a bra).
'behind' means one lot of letters go next to another.
'vessel' becomes 'can' (type of container).
'er' inserted into 'bra' is 'berra'.
'berra' put after 'can' is 'CANBERRA'.
Can you help me to learn more?
(Other definitions for canberra that I've seen before include "Strange crab near Australia" , "Capital of Australia" , "Southern hemisphere capital city" , "Nab racer, oddly, in Australia" , "Capital - bomber - liner" .)