Be holding a bone, as an inducement (5)
I believe the answer is:
Here is my best explanation:
'an inducement' is the definition.
(I've seen this before)
'be holding a bone' is the subsidiary indication.
'holding' means one lot of letters goes inside another.
'a bone' becomes 'rib' (rib is a kind of bone).
'be' placed around 'rib' is 'bribe'.
'as' is the link.
(Other definitions for bribe that I've seen before include "Money offered to corrupt", "Illegal incentive", "Inducement", "Illegal inducement", "Kickback", "Sweetener, inducement", "Illegal payment in exchange for favour", "sweetener", "Backhander" and "Sweetener, back-hander".)