He often assisted insane scientist dig for missing heads (4)

I believe the answer is:

igor

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'he' is the definition.

I don't understand the remainder of the clue.

(Other definitions for igor that I've seen before include "Stravinsky's first name" , "Stravinsky, perhaps" , "Prince --, opera by Borodin" , "Prince in Borodin's opera" , "Card game" .)

I've seen this clue in The Irish Times.

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