1 down
Aim
is
to
shrink
Fort
Custer
by
half
(5)
Aim is to shrink Fort Custer by half (5)
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The definition is at the beginning of the clue.
How the clue works
The definition is Aim — a target or centre of attention. The wordplay has you shrinking two words by half each: lop half off Fort and you get FO, do the same to Custer and you get CUS, then put them together.