भस्त्रादिभ्यः ष्ठन्

Operational rule vidhi

The affix ष्ठन् comes in the sense of 'he conveys' after the words भस्त्र etc. being in the Instrumental -3rd case in construction.

Word by word (padaccheda)

Left context भस्त्रा- आदिभ्यः pañcamī · bahuvacanaSubstitute / term ठ prathamā · ekavacana

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.

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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

भस्त्रा-आदिभ्यः ष्ठन्

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

Commentary

The affix ष्ठन् comes in the sense of 'he conveys' after the words भस्त्र etc. being in the Instrumental -3rd case in construction.
Thus भस्त्रया हरति = भ꣡स्त्रिकः "who conveys by means of a leathern bag, a carrier". The feminine will be भस्त्रिकी꣡ 4.1.41. So भ꣡रटिकः f. भरटिकी꣡ ॥ The word भस्त्र means a leathern bellows by which the iron is heated, or a leathern bag in which grain &c, is carried.

1 भस्त्रा, 2 भरट, 3 भरण (भारण), 4 शीर्षभार, 5 शीर्षेभार, 6 असंभार, 7 अंसेभार ॥

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