Dig out a cave, Tex ordered (8)
I believe the answer is:
excavate
'dig out' is the definition.
'a cave tex ordered' is the wordplay.
'ordered' indicates an anagram.
'a'+'cave'+'tex'='acavetex'
'acavetex' anagrammed gives 'EXCAVATE'.
(Other definitions for excavate that I've seen before include "Quarry" , "With spade" , "mine" , "Unearth" , "Dig out material from the ground" .)