Rumoured returns mostly left on adult spread (8)
I believe the answer is:
diaspora
'spread' is the definition.
(I know that Diaspora is a type of dispersion)
'rumoured returns mostly left on adult' is the wordplay.
'rumoured' becomes 'said' (I've seen this before).
'returns' says the letters should be written in reverse.
'mostly' means to remove the last letter.
'left' becomes 'port' (left side of a ship - opposite of starboard).
'on adult' becomes 'a' (abbreviation. I am not sure about the 'on' bit.).
'said' backwards is 'dias'.
'port' with its last letter removed is 'por'.
'dias'+'por'+'a'='DIASPORA'
Can you help me to learn more?
(Other definitions for diaspora that I've seen before include "people dispersing" , "Dispersion of a people from their homeland" , "A Paris do? (anag)" , "people's movement" , "The dispersion of Jews throughout the world" .)