One living abroad formerly — with a light touch (5)
I believe the answer is:
expat
'one living abroad' is the definition.
(I've seen this before)
'formerly with a light touch' is the wordplay.
'formerly' becomes 'ex' (prefix meaning former or onetime).
'with' means one lot of letters go next to another.
'a light touch' becomes 'pat' (pat can mean a soft touch).
'ex'+'pat'='EXPAT'
(Other definitions for expat that I've seen before include "Brit abroad, say" , "one settled abroad" , "who now uses overseas address?" , "overseas settler" , "Former countryman" .)