Relatively favourable (7)

I believe the answer is:

nepotic

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'favourable' is the definition.
Both the definition and answer are adjectives.
Maybe there's an association between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for nepotic that I've seen before include "tending to favour family" , "favouring 4 [NIECE]?" , "Keeping it in the family" , "Favouring one's relatives" , "not looking beyond the family?" .)

I've seen this clue in The Sunday Times and The Globe and Mail.

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