Reddish-brown primates making comeback across India (5)
I believe the answer is:
sepia
'reddish-brown' is the definition.
(I've seen this before)
'primates making comeback across india' is the wordplay.
'primates' becomes 'apes' (ape is a kind of primate).
'making comeback' says the letters should be written backwards.
'across' means one lot of letters goes inside another.
'india' becomes 'i' (phonetic alphabet: alpha, bravo, charlie etc.).
'apes' reversed gives 'sepa'.
'sepa' placed around 'i' is 'SEPIA'.
(Other definitions for sepia that I've seen before include "Reddish-brown; cuttlefish ink" , "cuttle" , "Denizen of deep" , "Shade of brown, as in old photographs" , "Sort of drawing" .)