पापं च शिल्पिनि

Operational rule vidhi

The word पाप is optionally acutely accented (उदात्त) on the first syllable when followed by a word denoting a professional man.

Word by word (padaccheda)

Substitute / term पापम् prathamā · ekavacanaIndeclinable च avyayaRight context शिल्पिनि 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").

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Full reading

पापम् च शिल्पिनि

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

Commentary

The word पाप is optionally acutely accented (उदात्त) on the first syllable when followed by a word denoting a professional man.
Thus पा꣡पनापितः or पापनापितः꣡, पा꣡पकुलालः or पापकुलालः꣡ ॥ This rule applies to the pratipadokta samasa of पाप in the sense of censure as taught in 2.1.54, when it is an appositional compound; and not when it forms a Genitive compound. Thus पापस्यनापितः = पापनापितः꣡ ॥

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