When was Humpty Dumpty in hospital? Presumably around the time Adam and Eve left the garden! (5,3,4)

'garden' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'when was humpty dumpty in hospital? presumably around the time adam and eve left' is the wordplay.
I cannot quite understand how this works, but
'when' could be 'e' (I've seen this in other clues) and 'e' is found within the answer.
'hospital?' could be 'h' (abbreviation for hospital on maps) and 'h' is found within the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
'time' could be 't' (abbreviation) and 't' is found in the answer.
'left' could be 'al' (I've seen this in other clues) and 'al' is located in the answer.
This may be the basis of clue (or it may be nonsense).

'the' acts as a link.

Can you help me to learn more?