Undertakers leisure time left creditor flummoxed (7,8)

'undertakers leisure' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'time left creditor flummoxed' is the wordplay.
I cannot really see how this works, but
'time' could be 'era' (era is a kind of time) and 'era' is found in the answer.
'left' could be 'l' (common abbreviation) and 'l' is found in the answer.
an anagram of 'creditor' is 'director' which is present in the answer.
The remaining letters 'fun' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?