Lincolnshire market town; birthplace of Margaret Thatcher (8)

I believe the answer is:

grantham

(Other definitions for grantham that I've seen before include "Lady Thatcher's birthplace" , "English town" , "Birthplace of Newton and Thatcher" , "Margaret Thatcher birthplace" , "Lincolnshire town; harm gnat (anag.)" .)

I've seen this clue in The Mirror.

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