गस्थकन्

Operational rule vidhi

The affix थकन् (थक) comes after the verb गै 'to sing' when the agent so expressed, denotes an artist.

Word by word (padaccheda)

Left context गः pañcamī · ekavacanaSubstitute / term थकन् 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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Full reading

गः थकन्

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

Commentary

The affix थकन् (थक) comes after the verb गै 'to sing' when the agent so expressed, denotes an artist.
As, गै + थकन् = गाथकः 6.1.45 'a singer', sem. गाथिका.

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