en_tn/isa/21/11.md

A declaration

"This is what Yahweh declares" or "This is a message from Yahweh"

about Dumah

This is another name for Edom. AT: "about the people of Dumah" or "about the people of Edom" (See: rc://en/ta/man/translate/translate-names and rc://en/ta/man/translate/figs-metonymy)

one calls to me

Here "me" refers to Isaiah.

Watchman, what is left of the night? Watchman, what is left of the night?

This is repeated for emphasis. (See: rc://en/ta/man/translate/figs-parallelism)

Watchman

See how you translated this in Isaiah 21:6.

if you will ask, ask, and then come back again

"if you want to ask, then come back later and ask"