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Thanks again jono. The HAS for 'knocks back' is really a bit meh, but I understand it. Thanks

10a. Vessel, one crossing a river boundary
CATAMARAN

20d. Potential killers picking up the pieces?
GUNMEN

24d. Report of person checking Pip's coat?
TESTA

13a. Butter mountain? The reverse!
IBEX

Parses for the above please.

10a. The river is the Tamar, A from the clue and CAN is the vessel, clued as ‘one’.
20d. Guns are pieces so the whole clue is cryptic.
13a The ibex is a mountain goat, hence a mountain butter.

24d. Sounds like tester. Definition refers to a seed coat with a pip inside.

Thanks again Jono. That butter (an animal that butts) was a bit of a groaner!

A while back I won Peer Review with the same “butter” gag…

Try a final helping of peanut butter! (4)

try is GO, A in the clue, final T of peanut. Butter is the definition.
Very good 👍

16a. Mammoth is not bound to pachyderm's middle
MIGHTY

11a. I myself must go after British medic, unqualified?
BONESETTER

20a. Strictly requires this old couple to visit branch
FOOTWORK

15d. Dark sort of envelope hosts deliver
SATURNINE

Parses for the above please

20a. “Strictly requires this” - a reference to Strictly Come Dancing or perhaps Strictly Ballroom.
O old, TWO couple, inside FORK branch.

15d: In USA, SASE is abbrev. for "self addressed stamped envelope". Assuming SAE is the UK equivalent for "self addressed envelope", 15 parses as TURN IN inside SAE.