Alfresco love song about a writer (4-3)
I believe the answer is:
open-air
'alfresco' is the definition.
(I know that alfresco can be written as open-air)
'love song about a writer' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'song' becomes 'air' (I've seen this in another clue).
'about' says to put letters next to each other.
'a writer' becomes 'pen' (something which writes).
'air' put after 'pen' is 'penair'.
'o'+'penair'='OPEN-AIR'
(Other definitions for open-air that I've seen before include "not below roof" , "Alfresco" , "Taking place outdoors" , "Outdoor" , "Exposed to the elements" .)