Kavyalankarasarasamgraha 5.44

5.44

atra lambālakatvādayaḥ kāryarūpatvāt kāraṇabhūtaṃ gajāsuravadhaṃ vācyavācakavyāpārāspṛṣṭamapi gamayanti /
tena ca tathāvidhayā vicchittyā avagamyamānenārthena te lambālakatvādayor'thā alaṅkiyante /
tasmātparyāyoktamalaṅkāraḥ //

Here, being effects, loosened locks and the rest convey the slaying of the elephant-demon, which is their cause, even though untouched by the operation of the expressed and expressive.
And by that meaning which is comprehended through such strikingness, those meanings such as loosened locks and the rest are ornamented.
Therefore, it is the ornament periphrasis (paryāyokta).