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Such a little word but I can't find a sensible answer.
2 d Saharan dunes rising in German area (4) A ? E C

That's understandable because your last letter should be (or even is?) a G not a C...

Thank you jackNatter.AREG an alternative to ERG

Yup, GER A reversed.

Thanks again

Last four.......24A. Works directly taken by tenor, note (6) DUE--I.
34A. Backward once on getting into sandarac tree (6) -R--AR.
15D. Willy's high-quality cloth from Yorkshire (9) -E-ISCO--.
22D. Son's weight causing bruise as before (6) S--NN-.

24a DUE (directly) T (tenor) TI (note) = DUETTI

34a RE (on) in ARAR (sandarac tree) = ARREAR

15d PENIS (willy) TONE (high[-]quality) = PENISTONE (your 'C' is wrong)

22d S (son) TONNE (weight) = STONNE

...28a is NOVATE (VAT in NOE[l]) rather than NOVICE.

Jacknatter.... many thanks indeed for shining the light for me! Happy New Year.

...And a very happy New Year to you (and all Mephisto solvers) too!