No one getting cross, rolling round? I sure don't react! (5)
I believe the answer is:
xenon
'round? i sure don't react' is the definition.
I can't tell whether this defines the answer.
'no one getting cross rolling' is the wordplay.
'no' becomes 'none' (I've seen this before).
'one getting' says to put letters next to each other.
'cross' becomes 'x' (X is cross-shaped).
'rolling' says the letters should be written backwards.
'none'+'x'='nonex'
'nonex' backwards is 'XENON'.
Can you help me to learn more?
(Other definitions for xenon that I've seen before include "Inert gas, Xe" , "Noble gas used in lamps" , "One of the noble gasses" , "member of nobility?" , "One of the noble set" .)