Totally empty urn tipped over Indian gully (5)
I believe the answer is:
nulla
'indian gully' is the definition.
I know nothing about this answer so I can't judge whether this works.
'totally empty urn tipped' is the wordplay.
'totally' becomes 'all' (I've seen this in another clue).
'empty' says to hollow out the word (remove centre letters).
'tipped' shows that the letters should be reversed in order (letters tipped over).
'urn' with its centre taken out is 'un'.
'all'+'un'='allun'
'allun' in reverse letter order is 'NULLA'.
'over' is the link.
Can you help me to learn more?
(Other definitions for nulla that I've seen before include "ravine" , "Stream" .)