Yellowish-brown lion color (5)
I believe the answer is:
tawny
'yellowish-brown lion color' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tawny that I've seen before include "Orange-brown in colour" , "Yellowish-brown - kind of owl" , "port" , "Golden brown" , "Brownish-yellow" .)