Help With Everyman Crossword 3590

[Magicmeg]

Can anyone help with the following?
23 A 'Engineers joining line in charge of survival'. I think it could be relic but don' t know why
!0 A 'Dance in uncertain state' Is it Leaps? If so why?
6 A Four letters beginning with H. ',Be busy,quietly coming to prominence'

[Mamyalynne]

23 RE (Royal Engineers) + L + IC (in charge) a relic has survived

[dannyk13]

Re(engineers) + l(line) +ic(in charge) = Relic

[Mamyalynne]

10 Limbo - double def

6 Hump(prominence) - Hum (Busy) + P (quiet)

[Magicmeg]

Thank you Mamyalyn,dannyk. So easy when you actually see the answer.
I'm stuck on one final clue and that is 7D ' rip off piece starting in corner'
I have R?O?
I had just about given up the Everyman on Sunday. Could it be I'm getting used to the new setter?
Thanks again.

[dannyk13]

Rook- rip off and chess piece in corner of board.

[Mamyalynne]

Rook - Chess and to rip off

[Mamyalynne]

I prefer this new setter personally but not everyone agrees.

[Magicmeg]

Thank you dannyk13