प्राग्घिताद्यत्

Heading adhikāra यदधिकारः प्राग्घितीयः

The यत् प्रत्यय is used as a default for the प्राक्-हितीय meanings.

Word by word (padaccheda)

Indeclinable प्राक् avyayaFrom / after हितात् pañcamī · ekavacanaTerm / subject य prathamā · ekavacana

Indeclinable An avyaya such as च "and", वा "optionally", न "not".
From / after Pañcamī (5th case): "from X" or "after X"; in headings, often the limit of their scope.
Term / subject Prathamā (1st case): the term being defined, or the subject of the statement.

Dotted words are technical terms. Hover or tap one to see its card.

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

प्राक् हितात् यत्

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

Commentary

In each sūtra from this one forward to -- तस्मै हितम् 5.1.5, the affix यत् bears rule.
Thus in the next sutra तद्वहति रथयुगप्रासङ्गम् we must read the affix यत् ॥ रथ्यः, युग्यः, प्रासङ्ग्यः ॥

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