Off-white colour (5)
I believe the answer is:
ivory
'off-white colour' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ivory that I've seen before include "Like the tower" , "recluse's tower?" , "Substance in elephant tusks" , "Hard creamy-white dentine used for making ornaments" , "Yellowish white - material from tusks" .)