One week in, this has proven to be a fun distraction for me (and hopefully one for you too). Let's see how far it goes!
1A Def Clients Wordplay D-def with investigates
5A Def Shanties Wordplay Nuts (crazy), change 'n' (new) to 'h' (second choir)
6A Def The lucky Wordplay II (ones) around 'r' (top/behead 'or') + 's' (bottom of bets) + 'h' (at last ricH)
8A Def ||Country ||Wordplay Pal (friend) + au ('to' in French)
9A Def The centre of the storm Wordplay It's a palindrome
1D Def snack Wordplay Anagram of 'finds his chap' without (wanting) 'f' (fine) and Danish
2D Def colouring Wordplay Au (gold) in front of Ra (royal academy of artists)
3D Def A way for people Wordplay Still (is even now), but ended by an 'e' (England) instead of an 'l' (Luxembourg)
4D Def Article Wordplay Es (Spanish) + Say (speak)
7D Def Bright green? Wordplay final letters of cafe menu finish, but in reverse (turning)