Suited with tie and, primarily, evening dress (7)
I believe the answer is:
matched
'suited' is the definition.
(thesaurus)
'tie and primarily evening dress' is the wordplay.
I cannot really understand how this works, but
'tie' could be 'match' (I've seen this before) and 'match' is present in the answer.
The remaining letters 'ed' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'with' acts as a link.
Can you help me to learn more?
(Other definitions for matched that I've seen before include "Equalised" , "Was compatible with" , "having opposition" , "Equal (in quality or strength)" , "Equalled; paired" .)