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Thanks to mamya's help with a couple yesterday, I thought I had this one under control, but two in bottom right have me beaten. Help!
18d Flour, much favoured, highest grade.(6)
?A???A
24a Roman general's sign, or one taking its place.(6)
S?I??? The 5th letter of this answer will be the 4th letter of 18d.
I've got 'Raise' for 22d Advance from rear.(5) R???e giving i in 24a.

18 far in a

24 scipio (scorpio, -OR + I)

24 Scipio

Sign - Scorpio

remove 'or' replace with 'i' (one)

Brilliant.! Thanks kilgore trout and mamya, all done now.p