Crossword Genius

Postpone aeroplane yarn?

Ross

I believe the answer is:

mothball

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This clue might be a double definition.

'postpone' is the first definition.
Although both the answer and definition are verbs in their base form, I don't see how they can define each other.

'aeroplane yarn?' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

Can you help me to learn more?

(Other definitions for mothball that I've seen before include "Naphthalene or camphor sphere" , "put on back burner" , "Put into long-term storage" , "Camphor sphere used to keep stored clothing in good condition" , "Put on ice" .)

I've seen this clue in The Telegraph.
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