Record guile used around old postscript (8)
I believe the answer is:
epilogue
'postscript' is the definition.
(I've seen this before)
'record guile used around old' is the wordplay.
'record' becomes 'EP' (abbreviation for extended play record).
'used' indicates an anagram.
'around' is an insertion indicator.
'old' becomes 'o' (abbreviation).
'guile' anagrammed gives 'ilgue'.
'ilgue' enclosing 'o' is 'ilogue'.
'ep'+'ilogue'='EPILOGUE'
(Other definitions for epilogue that I've seen before include "concluding passage" , "Postscript to a literary work" , "Late religious message" , "Conclusion of story" , "Afterword" .)