Bananas go dry inside chicken, creating gas (8)
I believe the answer is:
hydrogen
'gas' is the definition.
(I know that hydrogen is a type of gas)
'bananas go dry inside chicken' is the wordplay.
'bananas' indicates an anagram (bananas can informally mean crazy).
'inside' indicates putting letters inside.
'chicken' becomes 'hen' (hen is a kind of chicken).
'go'+'dry'='godry'
'godry' is an anagram of 'ydrog'.
'ydrog' placed inside 'hen' is 'HYDROGEN'.
'creating' acts as a link.
(Other definitions for hydrogen that I've seen before include "H in chemistry" , "bomb-maker" , "Flammable gas" , "Element with atomic number 1" , "Ubiquitous gas" .)