The sauce bottle (5)
I believe the answer is:
nerve
I believe this is a double definition.
'the sauce' is the first definition.
(I've seen this before)
'bottle' is the second definition.
(both can mean courage)
(Other definitions for nerve that I've seen before include "Cord that carries instructions from brain to body" , "Strand of body tissue" , "Coolness under fire" , "Boldness" , "presumption" .)