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The ClueDiminish (4 letter answer)
NotesThe answer WANE is seen frequently, appearing about once every 160 puzzles.
Anagram for anew
Antithesis of wax
Draw to a close
Draw to an end
Opposite of wax
Pass one's heyday
Become less bright, as the moon
DefinitionWANE as a noun:
1. (ebb, ebbing, wane) = a gradual decline (in size or strength or power or number)
WANE as a verb:
1. (decline, go down, wane) = grow smaller; "Interest in the project waned"
2. become smaller; "Interest in his novels waned"
3. decrease in phase; "the moon is waning"