Can distant cousins be so described? (6)

I believe the answer is:

inbred

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'described?' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for inbred that I've seen before include "too much Montague blood?" , "Binder (anag)" , "From too-closely-related family" , "Present by nature" , "Existing from birth, derived from parentage" .)

I've seen this clue in The Irish Times.

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