Poor old ruse used in place of miracle (7)
I believe the answer is:
lourdes
'place of miracle' is the definition.
'lourdes' can be an answer for 'place' (I have seen 'Place of pilgrimage ' mean 'lourdes' so perhaps 'place' could also mean 'lourdes'). I am unsure of the 'of miracle' bit.
'poor old ruse' is the wordplay.
'poor' indicates an anagram.
'old'+'ruse'='oldruse'
'oldruse' is an anagram of 'LOURDES'.
'used in' acts as a link.
Can you help me to learn more?
(Other definitions for lourdes that I've seen before include "French pilgrimage site" , "Lured so to revered shrine in south of France" , "Famous centre of pilgrimage in SW France" , "Shrine in SW France" , "location of miracles" .)