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Old,
half-hearted
rotter
disgruntled
(5)
Old, half-hearted rotter disgruntled (5)
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The definition is at the beginning of the clue.
How the clue works
Old is your definition, the retro look. Now take ROTTER and go "half-hearted" on it - knock out one of the two middle T's, leaving you with ROTER - then "disgruntled" tells you to shuffle those letters into an anagram, giving RETRO.