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7d. Unconventional Artist Stormed In Out Of Control. 9 Letts. M-d-r-i-t. 24a. Beer Brought On Board In Commercial Exchange. 5Letts. S---s. 25d. Strip Of Wood One Provided As Weapon. 5Letts .--t-i.

7 modernist

sales
lathi

possibly S-ALE-S

7D MODERNIST - anagram of "stormed in"
24A SALES - "ale" in "SS" (on board)
25D LATHI - Lath & I (Eastern matial arts weapon)

7 is an anagram of stormed in
24 is ale (beer) brought onboard (SS) = commercial exchanges - sales
25 strip of wood = lath (as in lath and plaster) + i (one) lathi is a weapon

Thanks chrisG.