When daughter is sick in America and they're charged, it disenchants them (12)

'charged it disenchants them' is the definition.
I can't judge whether this definition defines the answer.

'when daughter is sick in america and' is the wordplay.
I cannot quite see how this works, but
'when' could be 'on' (I've seen this in other clues) and 'on' is found within the answer.
'daughter' could be 'd' (genealogical abbreviation) and 'd' is found in the answer.
'is' is present in the answer.
'sick' could be 'ill' (synonyms) and 'ill' is found within the answer.
'america' could be 'us' (United States) and 'us' is present in the answer.
The remaining letters 'is' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'they're' acts as a link.

Can you help me to learn more?