Traditionally, a heavenly supporter (5)

I believe the answer is:

atlas

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'supporter' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for atlas that I've seen before include "Reference work" , "He had the world on his shoulders" , "Titan who held up the sky" , "The first cervical vertebra" , "I carry a huge weight" .)

I've seen this clue in the Evening Standard.

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