Watch, maybe offering bottle (6)
I believe the answer is:
ticker
This clue is a double definition.
'watch maybe' is the first definition.
(watches tick)
'bottle' is the second definition.
(ticker can informally mean nerve or bottle)
'offering' is the link.
(Other definitions for ticker that I've seen before include "Old watch or informal heart" , "Heart (sl.)" , "Telegraph instrument" , "Slang heart or old spring watch" , "Hunter, perhaps" .)