Dig starts to discover extraordinary lead vases everywhere (5)
I believe the answer is:
delve
'dig' is the definition.
(I know that delve is a action)
'starts to discover extraordinary lead vases everywhere' is the wordplay.
'starts to' suggests taking the first letters.
The first letters of 'discover extraordinary lead vases everywhere' is 'DELVE'.
(Other definitions for delve that I've seen before include "Dig - research deeply" , "Dig - rummage" , "Burrow" , "Dig deep" , "Dig - investigate" .)