15 across
Occasionally
forgot
duo’s
name
for
this
little
character
(6)
Occasionally forgot duo’s name for this little character (6)
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The definition is at the end of the clue.
How the clue works
The phrase this little character points to Tolkien's famous small folk. If you take every other letter ('occasionally') from "forgot duo's" — picking out the second, fourth, sixth letters and so on — you get F o R g O t D u O, spelling out the name of a particularly famous young hobbit.