अशाला च

Operational rule vidhi

A तत्-पुरुष compound ending with the word सभा 'court', when it does not mean a house but means concourse, is neuter.

Word by word (padaccheda)

Substitute / term अ- शाला prathamā · ekavacanaIndeclinable च avyaya

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".

Full reading

अ-शाला च

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

Commentary

A तत्-पुरुष compound ending with the word सभा 'court', when it does not mean a house but means concourse, is neuter.
As, स्त्रीसभम्, दासीसभम् 'the concourse of ladies and slaves;' otherwise अनाथसभा 'the poor-house.'

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