Details from Elrond at Ardor (4)
I believe the answer is:
data
'details' is the definition.
(I've seen this in another clue)
'from elrond at ardor' is the wordplay.
'from' indicates a hidden word.
'DATA' can be found hidden inside 'elrond at ardor'.
(Other definitions for data that I've seen before include "Series of measurements" , "Facts and figures as fed to computers (4)" , "Input; facts" , "Contents of some banks?" , "Raw facts" .)