Place of worship is replacing a power tool (6)
I believe the answer is:
chisel
'tool' is the definition.
(chisel is a kind of tool)
'place of worship is replacing a power' is the wordplay.
'place of worship' becomes 'ch' (I've seen this in other clues).
'replacing a power' becomes 'el' (I can't explain this - if you can you should give a lot more credence to this answer).
'ch'+'is'+'el'='CHISEL'
Can you help me to learn more?
(Other definitions for chisel that I've seen before include "Carpentry tool" , "Sculpting tool" , "Tool with bevelled edge for shaping wood" , "Sculptor's tool" , "Hammered cutting tool" .)