Spooner's a dirty brown, perhaps, for half the weekend (6)
I believe the answer is:
sunday
'the weekend' is the definition.
(thesaurus)
'spooner's a dirty brown perhaps for half' is the wordplay.
I cannot quite understand how this works, but
'a' is present in the answer.
'brown' could be 'sun' (both can mean to get a tan) and 'sun' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for sunday that I've seen before include "Mothering --" , "Day of the week" , "Sat before this" , "This is "domenica" in Italy" , "The Sabbath for most Christians" .)