Crossword Genius

Motorboat put to sea (6)

Ross

I believe the answer is:

launch

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'motorboat' is the definition.
(launch is a kind of motorboat)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for launch that I've seen before include "Set (a boat) afloat" , "Rocket journey's starting point" , "Of ship, formally set afloat" , "Boat - set in motion" , "Craft - project" .)

I've seen this clue in The Sun.
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