Odd bits of wine in river — port? (5)
I believe the answer is:
tawny
'port?' is the definition.
(I've seen this before)
'odd bits of wine in river' is the wordplay.
'odd bits of' indicates alternate letters.
'in' indicates putting letters inside.
'river' becomes 'tay' (Scottish river).
The alternate letters of 'wine' are 'wn'.
'wn' going within 'tay' is 'TAWNY'.
(Other definitions for tawny that I've seen before include "Orange-brown in colour" , "port" , "Brownish-yellow" , "Golden brown" , "Yellowish-brown - kind of owl" .)