Feeling emotional as one left one's old home (5)
I believe the answer is:
moved
'feeling emotional' is the definition.
I can't tell whether this defines the answer.
'one left one's old home' is the wordplay.
'one' becomes 'i' (Roman numeral).
'left' suggests deleting specific letters.
'one's' becomes 'I'm' ('one is' is a formal way of saying 'I am').
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'home' becomes 'ved' (I am not sure about this - if you are sure you should believe this answer much more).
'im' with 'i' taken away is 'm'.
'm'+'o'+'ved'='MOVED'
'as' acts as a link.
Can you help me to learn more?
(Other definitions for moved that I've seen before include "Budged" , "Joyfully tearful," , "Changed one's home" , "Shifted" , "proposed" .)