The position of one whose final departure is imminent (2,6,4)
I believe the answer is:
at deaths door
'imminent' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'the position of one whose final departure' is the wordplay.
I cannot really see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
'of' could be 'o' and 'o' is present in the answer.
'one' could be 'o' (I've seen this in other clues) and 'o' is found within the answer.
'departure' could be 'death' (I've seen this in another clue) and 'death' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'is' is the link.
Can you help me to learn more?
(Another definition for at deaths door that I've seen is " Critically ill".)