Crossword Genius

Seemed upset with underpowered bike (5)

Ross

I believe the answer is:

moped

I'm a little stuck... Click here to teach me more about this clue!

'bike' is the definition.
(I know that moped is a type of minibike)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for moped that I've seen before include "means of transport" , "dejected" , "Despaired" , "simple conveyance" , "Power-assisted vehicle" .)

I've seen this clue in The Independent.
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