Crossword Genius

Shape of alternative toy balloon, eg (6)

Ross

I believe the answer is:

oblong

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'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?" .)

I've seen this clue in the Sydney Morning Herald.
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