Dig up from plateau near Thiepval (7)
I believe the answer is:
unearth
'dig up' is the definition.
(thesaurus)
'from plateau near thiepval' is the wordplay.
'from' says the answer is hidden in the clue.
'UNEARTH' is hidden in the letters of 'plateau near thiepval'.
(Other definitions for unearth that I've seen before include "Expose" , "Disinter" , "Dig up - uncover" , "Cut a certain wire" , "Find by digging" .)