All in one piece (6)
I believe the answer is:
intact
'all in one piece' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for intact that I've seen before include "Undamaged, not broken" , "Undamaged, unimpaired" , "All in one piece" , "Not broken or damaged" , "Not damaged or missing a part" .)