Crossword Genius

Taboo being mean online but funny (13)

Ross

I believe the answer is:

unmentionable

'taboo' is the definition.
(something taboo is not to be mentioned)

'mean online but funny' is the wordplay.
'funny' is an anagram indicator.
'mean'+'online'+'but'='meanonlinebut'
'meanonlinebut' with letters rearranged gives 'UNMENTIONABLE'.

'being' is the link.

(Other definitions for unmentionable that I've seen before include "Forbidden as a topic of conversation" , "Not fit to be referred to" , "Taboo" .)

I've seen this clue in The Times.
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