Spindles without even a flank (4)
I believe the answer is:
side
'flank' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for side that I've seen before include "by no means a front" , "group of players" , "long forgotten" , "party" , "Left or right, say" .)