21 across
Otherwise
show
one
mercy
in
service
(8)
Otherwise show one mercy in service (8)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
The definition is service — a ceremony is a formal rite or service. "Otherwise" signals that something's being jumbled up, and if you take the letters of one mercy and rearrange them, you get your answer.