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Stuck in top left corner.
1a.'Shellfish devouring hound' - artist's portrayal of evolution.(9)
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4d Produce document again, in its entirety, perhaps.(6) ????P?

Fisrt is a very technical term - CLADOGRAM - CLAM DOG RA. It's a diagram showing evolutionary relationships between species.

in its enti(rety, pe)rhaps

Thanks to you both that has opened up last part nicely.

this is a prize crossword and I really enjoy trying it;but to ask for help this early ,on any site ,shows a lack of conviction.
The crossword does not need to be finished for another 4 weeks at the earliest.