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Short clues proving frustrating today.

Would appreciate solution and parsing for this one before I tear out all my hair.

16 across: Heading off to scale this part of tree (4)
Have ?O?B

Thank you

Enigma

(C)limb.

Thanks Rusty

Will have to look again at 7 down.

Enigma

12 ac American porter, say, one strikingly helpful to sailors (4,4) ?e??/?u??

bell buoy - sounds like bell boy?

Thank you tevor.