Gaudy temple set up with uninteresting foundation (6)
I believe the answer is:
tawdry
'gaudy' is the definition.
('tawdry' can be a synonym of 'gaudy')
'temple set up with uninteresting foundation' is the wordplay.
'temple' becomes 'wat' (type of Asian temple eg Angkor Wat).
'set up' shows that the letters should be reversed in order.
'with uninteresting foundation' becomes 'dry' (I can't justify this - if you can you should give a lot more credence to this answer).
'wat' in reverse letter order is 'taw'.
'taw'+'dry'='TAWDRY'
Can you help me to learn more?
(Other definitions for tawdry that I've seen before include "Cheap; sleazy" , "In poor taste" , "Vulgar" , "Showy and gaudy but without real value" , "Cheap and shoddy" .)