Sex is mentioned, apparently (2,2,4)
I believe the answer is:
it is said
'apparently' is the definition.
'sex is mentioned' is the wordplay.
'sex' becomes 'it' (a common euphemism).
'mentioned' becomes 'said' (I've seen this before).
'it'+'is'+'said'='IT IS SAID'
I've seen this clue in The Independent.
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