Prayer ___

VIGIL

["\"Think of a solemn overnight watch.\""]

The clue "Prayer ___" leads to the answer "VIGIL" through a straightforward definition. A vigil is often a period of time spent in prayer or watchful attention, especially at night, and is commonly associated with religious or spiritual practices. Therefore, the word "VIGIL" fits well with the clue, as it is a term closely related to prayer. There is no complex wordplay or pun involved; it's a direct reference to a well-known religious practice.