Just pay attention to upper-class ideas for a change! (8)
I believe the answer is:
unbiased
'just' is the definition.
(thesaurus)
'pay attention to upper-class ideas for a change' is the wordplay.
'pay attention' becomes 'nb' (NB - nota bene in Latin - indicates a written note).
'to' says to put letters next to each other (I've seen this in other clues).
'upper-class' becomes 'u' ('u' can be similar in meaning to 'upper-class').
'for a change' indicates an anagram.
'ideas' with letters rearranged gives 'iased'.
'nb' after 'u' is 'unb'.
'unb'+'iased'='UNBIASED'
(Other definitions for unbiased that I've seen before include "without taking sides" , "fair" , "Not partial or prejudiced" , "without side" , "Impartial" .)