Crossword Genius

One’s left by lover hiding drug dependency (4,2,3)

Ross

I believe the answer is:

isle of man

I'm a little stuck... Click here to teach me more about this clue!

'dependency' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'one's left by lover hiding drug' is the wordplay.
I cannot really see how this works, but
'one's' could be 'is' (Roman numeral) and 'is' is located in the answer.
'left' could be 'l' (common abbreviation) and 'l' is found within the answer.
'drug' could be 'e' (E is another name for ecstasy) and 'e' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for isle of man that I've seen before include "Where to find the House of Keys" , "Its capital is Douglas and its cats are tailless" , "directed by Douglas" , "Its cats are said to be lacking tails" , "Island in the Irish Sea" .)

I've seen this clue in The Sunday Times.
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