A titan bound to be supportive (5)

I believe the answer is:

atlas

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'a titan' is the definition.
(Atlas is an example)

I cannot understand how the remainder of the clue works.

(Other definitions for atlas that I've seen before include "One of the Titans" , "Chart book" , "Mythological Titan (involved with the world of maps?)" , "Collection of maps" , "Supporter of the classics" .)

I've seen this clue in the Evening Standard.

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