Interfering, constructing giant perm (9)
I believe the answer is:
tampering
'interfering' is the definition.
(tampering is a kind of interfering)
'constructing giant perm' is the wordplay.
'constructing' indicates anagramming the letters.
'giant'+'perm'='giantperm'
'giantperm' is an anagram of 'TAMPERING'.
I've seen this clue in The Daily Express.
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