Extravagant or excessive (6)
I believe the answer is:
lavish
This clue is a double definition.
'extravagant' is the first definition.
(synonyms)
'excessive' is the second definition.
(I've seen this before)
(Other definitions for lavish that I've seen before include "Prodigal - unrestrained" , "Sumptuous" , "Plentiful or extravagent" , "Generous, profuse" , "Generous - liberal" .)