English empirical philosopher (the 'Father of Liberalism'), d. 1704 (5)
I believe the answer is:
locke
(Other definitions for locke that I've seen before include "A philosopher; sounds like strand of hair" , "John -, seventeenth to eighteenth century English philosopher" , "English empiricist philosopher, d. 1704" .)
I've seen this clue in The Guardian.
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