तदर्हम्

Operational rule vidhi

The affix वति (वत्) comes after a word in the Accusative -2nd case in construction in the sense of 'befitting that or suited to that'.

Word by word (padaccheda)

Object तत् dvitīyā · ekavacanaSubstitute / term अर्हम् prathamā · ekavacana

Object Dvitīyā (2nd case).
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

तत् अर्हम्

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

Commentary

The affix वति (वत्) comes after a word in the Accusative -2nd case in construction in the sense of 'befitting that or suited to that'.
As राजानमर्हति = राजवत् पालनम् "the protection as befits a king i.e. as a king should protect". ब्राह्मणवत्, ऋषिवत्, क्षत्रियवत् ॥

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