Check publisher of online talks, without humour and dull (4-6)

I believe the answer is:

slow-witted

'dull' is the definition.
(thesaurus)

'check publisher of online talks without humour' is the wordplay.
'check' becomes 'slow' (check can mean to slow or restrain).
'publisher of online talks' becomes 'TED' (as in TED Talks).
'without' indicates putting letters inside ('without' can be similar in meaning to 'outside').
'humour' becomes 'wit' (synonyms).
'slow'+'ted'='slowted'
'slowted' placed around 'wit' is 'SLOW-WITTED'.

'and' is the link.

I've seen this clue in The Independent.

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