पार्श्वेनान्विच्छति

Operational rule vidhi

The affix कन् comes in the sense of 'who strives to gain something by that' after the word पार्श्व in the Instrumental -3rd case in construction.

Word by word (padaccheda)

With / by पार्श्वेन tṛtīyā · ekavacanaVerb अन्विच्छति tiṅanta

With / by Tṛtīyā (3rd case): accompaniment or means.
Verb A finite verb form (tiṅanta).

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Full reading

पार्श्वेन अन्विच्छति

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The affix कन् comes in the sense of 'who strives to gain something by that' after the word पार्श्व in the Instrumental -3rd case in construction.
The word पार्श्वम् means 'a fraudulent or crooked expedient'. One who endeavours to obtain any thing by fraud is called पार्श्वकः 'a cheat, a juggler, a partisan'. पार्श्व = a rib, a crooked thing; as पार्श्वकः = मायाविन्, कौसृतिकः, जालिकः &c.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.