I got lineages disentangled? (11)

I believe the answer is:

genealogist

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'i' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'got lineages disentangled?' is the wordplay.
'got lineages' can be anagrammed to 'GENEALOGIST'.
But, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for genealogist that I've seen before include "Student of descent" , "Ancestor tracer" , "who may explore a particular line" .)

I've seen this clue in The Times.

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