Fixing collar and evening dress, primarily before getting regional tie? (5,5)
I believe the answer is:
local derby
'regional tie?' is the definition.
(tie can mean a sporting fixture)
'fixing collar and evening dress primarily before' is the wordplay.
'fixing' is an anagram indicator.
'and' is a charade indicator (letters next to each other) (I've seen this in other clues).
'primarily' indicates taking the first letters.
'before' becomes 'by' (**).
The initial letters of 'evening dress' is 'ed'.
'collar' after 'ed' is 'edcollar'.
'edcollar' anagrammed gives 'localder'.
'localder'+'by'='LOCAL DERBY'
'getting' is the link.
(Other definitions for local derby that I've seen before include "Fixture between nearby teams" , "Encounter neighbours" , "grudge match?" , "Meeting of neighbours" , "big match" .)