Work with IT company after switching musical direction (1,5)

I believe the answer is:

a tempo

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'musical direction' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for a tempo that I've seen before include "Staff direction" , "At the previous speed (music)" , "In time (music)" .)

I've seen this clue in The Guardian.

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