Centre features extravagant outdoor bath (3,3)
I believe the answer is:
hot tub
'outdoor bath' is the definition.
(I've seen this before)
'centre features extravagant' is the wordplay.
'centre' becomes 'hub' (hub is a kind of centre).
'features' means one lot of letters goes inside another.
'extravagant' becomes 'ott' (short for over the top).
'hub' going around 'ott' is 'HOT TUB'.
(Other definitions for hot tub that I've seen before include "Very warm bath" , "Spa feature" , "Relax here in warmth" , "critical comment" , "Bath large enough for several people" .)