Crossword Genius

A giant bound? (5)

Ross

I believe the answer is:

atlas

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This might be a double definition.

'a giant' is the first definition.
(I've seen this before)

'bound?' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

Can you help me to learn more?

(Other definitions for atlas that I've seen before include "Size of paper once" , "A geog. book; N. African range" , "used for maps" , "Plans" , "African mountain range" .)

I've seen this clue in the Evening Standard.
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