Fast plane (3)

I think it could be either:

Which length description are you looking for?:

sst

'fast plane' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for jet that I've seen before include "Type of plane" , "flies fast" , "Glossy black colour" , "Hard black mineral used as gem" , "Jumbo plane?" .)

I've seen this clue in the USA Today, the King Feature Syndicate, the LA Times and The Mirror.

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