Set ovary in motion - be my guest! (4,4)

I believe the answer is:

stay over

'be my guest' is the definition.
(to stay over is to be a guest there)

'set ovary in motion' is the wordplay.
'in motion' indicates anagramming the letters (I've seen this in other clues).
'set'+'ovary'='setovary'
'setovary' with letters rearranged gives 'STAY OVER'.

(Another definition for stay over that I've seen is " not to leave till morning?".)

I've seen this clue in The Independent.

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