There he goes with flashy adornment, getting much more (8)
I believe the answer is:
trebling
'adornment getting much more' is the definition.
I can't tell whether this defines the answer.
'there he goes with flashy' is the wordplay.
'goes' is a deletion indicator.
'with flashy' becomes 'bling' (I am not sure about this - if you are sure you should believe this answer much more).
'there' with 'he' taken away is 'tre'.
'tre'+'bling'='TREBLING'
Can you help me to learn more?
(Other definitions for trebling that I've seen before include "Multiplying by three" , "Increasing threefold" .)