Rod getting caught by joint provides leverage (10,4)

'leverage' is the definition.
(bargaining chip is a kind of leverage)

'rod getting caught by joint' is the wordplay.
I cannot quite understand how this works, but
'rod' could be 'bar' (I've seen this before) and 'bar' is present in the answer.
'getting' could be 'gaining' (to get is to gain or obtain) and 'gaining' is found within the answer.
'caught' could be 'c' (cricket abbreviation) and 'c' is found in the answer.
'joint' could be 'hip' (part of body) and 'hip' is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

'provides' acts as a link.

Can you help me to learn more?