Inn there riotous? It's natural (8)
I believe the answer is:
inherent
'natural' is the definition.
(I've seen this before)
'inn there riotous?' is the wordplay.
'riotous?' indicates anagramming the letters (I've seen 'riotous' mean this).
'inn'+'there'='innthere'
'innthere' anagrammed gives 'INHERENT'.
'it's' acts as a link.
(Other definitions for inherent that I've seen before include "Inborn or intrinsic" , "Integral, innate" , "Underlying - integral" , "Basic" , "Built-in, integral" .)