Girl has left a subtle emanation (5)
I believe the answer is:
laura
'girl' is the definition.
(girl's name)
'left a subtle emanation' is the wordplay.
'left' becomes 'l' (common abbreviation).
'a subtle emanation' becomes 'aura' (I've seen this before).
'l'+'aura'='LAURA'
'has' is the link.
(Other definitions for laura that I've seen before include "- Ashley, Welsh clothes, furnishings designer" , "- Ashley, Welsh clothing and furniture designer" , "Cells of a group of recluses" , "1944 American film noir directed by Otto Preminger" , "girl" .)