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Affected
Reform
UK,
say,
with
head
removed
(4)
Affected Reform UK, say, with head removed (4)
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The definition is at the beginning of the clue.
How the clue works
The definition is Affected — as in pretentious or try-hard. "Reform UK, say" gives you PARTY (Reform UK being a political party, you see), and then "with head removed" tells you to lop off the first letter, the P, leaving you with ARTY.