Boxer from Belfast, on show in London? (7)

I believe the answer is:

cruiser

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

'boxer' is the definition.
(cruiser-weight is a type of boxer)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for cruiser that I've seen before include "privateer" , "A fast warship, sounds leisurely" , "Warship - pleasure boat - boxing weight" , "Old warship" , "Leisure yacht; warship" .)

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