शीर्षच्छेदाद्यच्च

Operational rule vidhi

The affix यत् as well as the above affixes come after the word शीर्षच्छेद in the Accusative -2nd case in the sense 'who deserves that under all circumstances'.

Word by word (padaccheda)

Left context शीर्षच्छेदात् pañcamī · ekavacanaSubstitute / term य prathamā · ekavacanaIndeclinable च avyaya

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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".

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Pink letters are it-markers (anubandhas), tags dropped by 1.3.9. Hover or tap one for the rule that marks it, or try the it-letter finder.

Full reading

शीर्षच्छेदात् यत् च

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

Commentary

The affix यत् as well as the above affixes come after the word शीर्षच्छेद in the Accusative -2nd case in the sense 'who deserves that under all circumstances'.
Thus शिरश्छेदं नित्यमर्हति = शीर्षच्छेद्यः, or शैर्षच्छेदिकः ॥ The word शिरस् is changed irregularly into शीर्ष before the affix.

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