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Having some trouble with 4d), the clue is.

Area by outskirts of Lille that's at heart of revolution (4) A -L -.

I'm going with axle

a = area, le = outskirts of Lille.

But can't see were the X comes in, any explanation gratefully accepted

By = X

X = "by" (as in 3 by 4 means 3 x 4)

Cheers guys, much appreciated