More than one standard is about trade (6)
I believe the answer is:
ideals
'more than one standard' is the definition.
(I've seen this in another clue)
'is about trade' is the wordplay.
'about' is an insertion indicator.
'trade' becomes 'deal' (synonyms).
'is' enclosing 'deal' is 'IDEALS'.
(Other definitions for ideals that I've seen before include "High values for ladies" , "Standards to aim for" , "High standards for ladies" , "Models of excellence" , "Standards of excellence" .)