...slightly involved in adding taste to gaudy display (8)
I believe the answer is:
dabbling
'adding taste to gaudy display' is the definition.
I can't tell whether this definition defines the answer.
'slightly involved' is the wordplay.
I cannot quite understand how this works, but
'involved' could be 'in' (to be involved in something is to be 'in' it) and 'in' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for dabbling that I've seen before include "Doing something without serious effort" , "dilettantish?" , "playing around" , "(Of duck) moving bill in water while feeding" , "behaving like a dilettante" .)