Stone mason turns up checking the last word (4)
I believe the answer is:
amen
'last word' is the definition.
(last word in a prayer)
'stone mason turns up checking' is the wordplay.
'checking' indicates the answer is hidden within the clue (I've seen 'checks' mean this (check can mean to curb or restrain)).
'turns up' shows that the letters should be reversed in order.
'nema' is hidden in the letters of 'stone mason'.
'nema' in reverse letter order is 'AMEN'.
'the' acts as a link.
(Other definitions for amen that I've seen before include "Extremist" , "Word of agreement" , "I agree!" , "prayer's ending" , "Conclusion of prayer" .)