Vocal type concealed for a laugh (4)

I believe the answer is:

oral

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'vocal' is the definition.
(thesaurus)

'concealed for a laugh' is the wordplay.
'concealed' indicates a hidden word.
'ORAL' is hidden in the letters of 'for a laugh'.

'type' is the link.
This may not be right. It may belong to another bit of the clue.

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(Other definitions for oral that I've seen before include "language exam" , "Viva voce" , "Mouth-related" , "Kind of exam" , "Spoken - examination" .)

I've seen this clue in the Irish Times.

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