Crossword Genius

Contain a two-quarter magnetic pointer (9)

Ross

I believe the answer is:

encompass

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'contain' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for encompass that I've seen before include "Contain or encircle" , "Comprehend" , "Embrace" , "Contrive" , "ring" .)

I've seen this clue in the Sydney Morning Herald.
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