Unit of magnetic field strength (7)

I believe the answer is:

oersted

'unit of magnetic field strength' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for oersted that I've seen before include "Physics unit of magnetic field strength" , "Ted Rose (anag) - Danish physicist who discovered electromagnetism" , "Physical unit" .)

I've seen this clue in The Times.

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