तत आगतः

Operational rule vidhi

The affix -- प्राग्दीव्यतोऽण् (4.1.83) etc. comes in the sense of 'what has come thence'.

Word by word (padaccheda)

Indeclinable तत avyayaSubstitute / term आगतः prathamā · ekavacana

Indeclinable An avyaya such as च "and", वा "optionally", न "not".
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

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Full reading

तत आगतः

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

Commentary

The affix -- प्राग्दीव्यतोऽण् 4.1.83 etc. comes in the sense of 'what has come thence'.
Thus स्रुघ्नादागतः स्रौघ्नः 'what has come from Srughna'. माथुरः, राष्ट्रियः ।

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