I originally wrote it with 'def but switched to 'mac precisely for that inconvenience. Could do it your way with:
(mac wipeop (op)
`(wipe (srvops* ',op)))
I like that these actually use 'wipe and literally wipe the op. The others are more parallel to 'wipe though in that they make the page say "nil" instead of "Unknown." Recall 'wipe sets a place to nil instead of undefining completely and making it cause
Error: "reference to undefined identifier: _test"
OTOH, I've wished before that 'wipe actually did this, and I realize it's kind of a trivial point.