Relaxes during business itself (4)

I believe the answer is:

sits

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'relaxes' is the definition.
Although both the answer and definition are verbs in their -s form, I can't see how one could define the other.

'during business itself' is the wordplay.
'during' says the answer is hidden in the clue.
'SITS' can be found hidden inside 'business itself'.

Can you help me to learn more?

(Other definitions for sits that I've seen before include "Perches" , "Is in session" , "Takes an exam" , "Poses for portrait" , "Takes a seat for the painter" .)

I've seen this clue in The Daily Express.

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