Change the lid or the pedestal of that vase (4)
I believe the answer is:
turn
'change the lid or the pedestal of that vase' is the definition.
'turn' can be an answer for 'change' (turn is a kind of change). I'm unsure of the remainder of the definition.
'that vase' is the wordplay.
'that' becomes 't' (this might be a standard abbreviation of which I'm unaware).
'vase' becomes 'urn' (both can mean a container).
't'+'urn'='TURN'
Can you help me to learn more?
(Other definitions for turn that I've seen before include "Rotate for a performer's act" , "Revolution by runt" , "rotation" , "Rotate - diverge - change" , "Sour" .)