5D) Nut tried roubles out (H _ A _). Could it be 'Head?'
17A) Food tossed out, having done foul (T _ _ U). I think it's 'Tofu', but can't see why.
18D) Blonde girl back in style (_ _ A _ R). 'Flair', possibly?
19A) Time to do something understanding (_ A _ T)
21D) Departed state, it's thought (_ D _ A). I think it's 'Idea', but need to get my head round as to why.
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