Contain a two-quarter magnetic pointer (9)
I believe the answer is:
encompass
'contain' is the definition.
(thesaurus)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for encompass that I've seen before include "Contain or encircle" , "Comprehend" , "Embrace" , "Contrive" , "ring" .)