flat at the poles (6)
I believe the answer is:
oblate
'flat at the poles' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for oblate that I've seen before include "Of spheroid, flattened at the poles" , "One bound to religious life" , "dedicated individual" , "monastic dedicatee" , "person who's dedicated" .)