Shape of alternative toy balloon, eg (6)
I believe the answer is:
oblong
'shape' is the definition.
(oblong is a kind of shape)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for oblong that I've seen before include "Log on B (anag.)" , "Figure with opposite sides parallel, longer in one direction" , "Oval" , "Rectangular two-dimensional figure" , "book form?" .)