A gaseous element held inside mum brings forward (8)
I believe the answer is:
maradona
'forward' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'a gaseous element held inside mum' is the wordplay.
'gaseous element' becomes 'radon' (I've seen this in another clue).
'held inside' is an insertion indicator.
'mum' becomes 'ma' (ma can mean mother).
'a'+'radon'='aradon'
'aradon' inserted into 'ma' is 'MARADONA'.
'brings' is the link.
Can you help me to learn more?
(Another definition for maradona that I've seen is " Diego --, Argentinian footballer".)