एकधुराल्लुक् च

Operational rule vidhi

The affix ख comes in the sense of 'what bears it' after the word एकधुरा being in Accusative -2nd case construction, the affix is optionally elided too.

Word by word (padaccheda)

Left context एकधुरात् pañcamī · ekavacanaSubstitute / term 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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Full reading

एकधुरात् 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 ख comes in the sense of 'what bears it' after the word एकधुरा being in Accusative -2nd case construction, the affix is optionally elided too.
The elision is optional. Thus एकधुरां वहति = एकधुरीणः or एकधुरः ॥ The compounding is taddhitartha (एकां धुरं वहति) to which is added the samasanta अ, and then the affix ख ॥

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