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6d, 3words, 3.2.4. ??l ?t ???e, Without warning Arthur initially, Lancelot is false.
6a, ????s?, A botanical garden's told to charge.
7d, ??z????, Artist at Green Gable's , perhaps, wasting hours?.
13a, ??k?, Representative of victory in retreat from Mafeking.
16a,??????, Call for extremely large part of gramophone.
17d, 2words, 3.6. ??s ???m?s, Monks with small chum in holiday location.

All at once

Accuse (A Kew's)

Cezanne - C(H)ez Anne

Nike ( hidden)

Needle - Need + (L)arg(E)

Las Palmas = Lamas + S + Pal

Thanks mamya for help , very grateful.

You're welcome