Crossword Genius

Make a great effort to find the ancestry (6)

Ross

I believe the answer is:

strain

I believe this clue is a triple definition!

'make' is the first definition.
(I know this)

'a great effort' is the second definition.
(I've seen this in another clue)

'to find' acts as a link.

'the ancestry' is the third definition.
(strain is a kind of ancestry)

(Other definitions for strain that I've seen before include "Exert oneself to the utmost" , "Pressure - filter" , "Stress or make taut" , "Distinct breed; use a seive" , "Overtired" .)

I've seen this clue in the Evening Standard.
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