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Requires
guts
to
oust
royal
(7)
Requires guts to oust royal (7)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
Right, Requires is your definition — as in necessitates or involves. For the wordplay, take ENTRAILS (that's your guts), then oust the R, the usual abbreviation for royal, and you're left with ENTAILS.