Sort of pies, a brownish colour (5)
I believe the answer is:
sepia
'brownish colour' is the definition.
(I've seen this before)
'sort of pies a' is the wordplay.
'sort of' indicates anagramming the letters.
'pies' is an anagram of 'sepi'.
'sepi'+'a'='SEPIA'
(Other definitions for sepia that I've seen before include "brownish colour" , "Shade of brown, as in old photographs" , "Colour from cuttlefish ink" , "Pigment got from cuttlefish ink" , "Brown of old photos" .)