I will cope - diamonds are badly run (3-7)

'i will' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'cope diamonds are badly run' is the wordplay.
I cannot really understand how this works, but
'cope' could be 'manage' (both can mean to get by) and 'manage' is located in the answer.
'diamonds' could be 'd' (abbreviation in bridge say) and 'd' is found within the answer.
'badly' could be 'ill' ('ill' can be adverbial as in 'ill-advised') and 'ill' is found within the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?