Double praise returned (4)
I believe the answer is:
dual
'double' is the definition.
(I know that double can be written as dual)
'praise returned' is the wordplay.
'praise' becomes 'laud' (lauding is a kind of praising).
'returned' says the letters should be written in reverse.
'laud' back-to-front is 'DUAL'.
(Other definitions for dual that I've seen before include "Twofold" , "Consisting of two parts" , "Double" , "Having two distinct functions" , "Consisting of pairs" .)