Expansively discuss citizen far from home I took in (9)
I believe the answer is:
expatiate
'expansively discuss' is the definition.
(to expatiate is to speak or write in detail about)
'citizen far from home i took in' is the wordplay.
'citizen far from home' becomes 'expat' (expatriate).
'took in' becomes 'ate' (take in can mean to eat).
'expat'+'i'+'ate'='EXPATIATE'
(Other definitions for expatiate that I've seen before include "Go on at length" , "Elaborate" , "Go into detail" , "Give details" , "Speak in detail (on)" .)