Meet fairly irregularly in descent (6,4)

I believe the answer is:

family tree

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'descent' is the definition.
The answer and definition can be both groups as well as being singular nouns.
Maybe there's a link between them I don't understand?

'meet fairly irregularly' is the wordplay.
'irregularly' is an anagram indicator.
'meet'+'fairly'='meetfairly'
'meetfairly' anagrammed gives 'FAMILY TREE'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for family tree that I've seen before include "Personal history" , "Genealogical chart" , "Chart of relations" .)

I've seen this clue in The Daily Express.

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