Crossword Genius

Andrew —, actor who played the title role in 1967 sci-fi film Quatermass and the Pit (4)

Ross

I believe the answer is:

keir

(Other definitions for keir that I've seen before include "__ Hardie, first leader of the Labour Party" , "Vat" , "Name of political leader" .)

I've seen this clue in The Mirror.
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