Last word about puzzle: Torquemada's First Surprise (9)
I believe the answer is:
amazement
'surprise' is the definition.
(I've seen this before)
'last word about puzzle torquemada's first' is the wordplay.
'last word' becomes 'amen' (last word in a prayer).
'about' means one lot of letters goes inside another.
'puzzle' becomes 'maze' (maze can mean a puzzling situation).
'torquemada's first' becomes 't' (1st letter of 'torquemada').
'amen' enclosing 'maze' is 'amazemen'.
'amazemen'+'t'='AMAZEMENT'
(Other definitions for amazement that I've seen before include "Astonishment, wonderment" , "Astonished reaction" , "Great astonishment" , "Incredulity" , "Stupefaction" .)