क्षुल्लकश्च वैश्वदेवे

Operational rule vidhi

The words महत् and क्षुल्लक retain their accent before the word वैश्वदेव.

Word by word (padaccheda)

Substitute / term क्षुल्लकः prathamā · ekavacanaIndeclinable च avyayaRight context वैश्वदेवे saptamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".
Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").

Full reading

क्षुल्लकः च वैश्वदेवे

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

Commentary

The words महत् and क्षुल्लक retain their accent before the word वैश्वदेव।
Thus महा꣡वैश्वदेवम्, and क्षुल्लक꣡वैश्वदेवम् ॥ The word kshullaka is derived thus क्षुधं लाति = क्षुल्लः to which the Diminutive क 5.3.73&c)) is added : and the word has udatta on the final.

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