Kind of humour with virtue — so funny (8)
I believe the answer is:
vitreous
'kind of humour' is the definition.
(vitreous humour is part of the eye)
'with virtue so funny' is the wordplay.
'with' says to put letters next to each other.
'funny' indicates anagramming the letters.
'virtue' next to 'so' is 'virtueso'.
'virtueso' with letters rearranged gives 'VITREOUS'.
(Other definitions for vitreous that I've seen before include "How glaze appears" , "Glassy" , "Made of glass" , "Resembling glass - over suit (anag)" , "Having glass-like finish or texture" .)