Extravagant place to go, to some extent? (6)
I believe the answer is:
lavish
'extravagant' is the definition.
(synonyms)
'place to go to some extent?' is the wordplay.
'place to go' becomes 'lav' (short for lavatory, somewhere to 'go').
'to some extent?' becomes 'ish' (adjectival suffix meaning to some extent).
'lav'+'ish'='LAVISH'
(Other definitions for lavish that I've seen before include "Extravagant or excessive" , "Splendid" , "Generous, profuse" , "Spend(ing) generously" , "Unstinting" .)