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In short, a bicycle and a half? (5)

Ross

I believe the answer is:

trike

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'in short' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for trike that I've seen before include "Tricycle (inf.)" , "Three-wheeled vehicle" , "Three-wheeled cycle" , "transport system" , "Three-wheeler" .)

I've seen this clue in the Evening Standard.
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