Lithosphere part (8,5)
I believe the answer is:
tectonic plate
'lithosphere part' is the definition.
(I know that lithosphere has part or parts tectonic plate)
This is the entire clue.
(Other definitions for tectonic plate that I've seen before include "large piece of land - with 13a" , "piece of crust" .)
I've seen this clue in the King Feature Syndicate.
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