The most common and most likely answer to this crossword clue is the 6 plus 4 letter word SUNDAY BEST
I've seen this crossword clue in The Times
S
U
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D
A
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T
More clues leading to the result SUNDAY BEST
- Top Gear star appearing with famous interviewer and footballer
- Use standby shifts for special clothes
- Midweek presumably not ideal for church clothes perhaps
- Worse for wear after Saturday night? Quite the opposite!
- Smart outfit? Yes, but smeared with sand
- ‘Top Gear’ star on prime time previously
- Glad rags say debt is settled, led by tabloid
- Model busy and is in French finery
- ‘Pudding!’ announced by footballer in glad rags
- Suit in church perhaps moved by sad tunes
Buddy explains!

The straight part
We know that "Worse for wear after Saturday night? Quite the opposite" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case worse for wear after saturday night? quite the opposite = sunday best.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.