Internal manoeuvres swamping Italy every thousand days roughly (9)
I believe the answer is:
triennial
'every thousand days roughly' is the definition.
I can't judge whether this definition defines the answer.
'internal manoeuvres swamping italy' is the wordplay.
'manoeuvres' indicates anagramming the letters (letters manoeuvred in a new way).
'swamping' means one lot of letters goes inside another (swamp can mean to surround or smother).
'italy' becomes 'i'.
'internal' is an anagram of 'triennal'.
'triennal' going around 'i' is 'TRIENNIAL'.
Can you help me to learn more?
(Other definitions for triennial that I've seen before include "Occurring every three years" , "Recurring every three years" , "lasting a few years" , "Regularly occurring" .)