The proof

It was then that Zachariah called (daAAa) on his Lord, he said "My Lord, grant me from You a good progeny, You are hearer of the prayers/calls (duAAa)."
The Angels called to him while he was standing/persisting in yusallee in the Temple enclosure (mihrabi) 'GOD gives you good tidings of John, authenticating the word from GOD, and a master, and steadfast, and a prophet from the upright.

In 338 it is clear Zachariah was imploring/calling/praying to his Lord. The following strongly implies the angels called to him while he was in the act of slw.

At the very minimum, can it can be concluded that prayer is part of slw?

Is 'yusallee' a verb or noun in this verse?

Wakas