Papal bed somehow accommodating a corrupting influence (1,3,5)

I believe the answer is:

a bad apple

'corrupting influence' is the definition.
(one bad apple may corrupt the rest)

'papal bed somehow accommodating a' is the wordplay.
'somehow' indicates an anagram.
'accommodating' indicates putting letters inside.
'papal'+'bed'='papalbed'
'papalbed' is an anagram of 'abadpple'.
'abadpple' going around 'a' is 'A BAD APPLE'.

I've seen this clue in The Times.

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