Daughter sprang, rested attention (7)

'sprang rested attention' is the definition.
The answer and definition can be both to do with fundamental existence as well as being past participle verbs.
Perhaps there's a link between them I don't understand?

'daughter' is the wordplay.
I cannot quite understand how this works, but
'daughter' could be 'd' (genealogical abbreviation) and 'd' is found in the answer.
The remaining letters 'welled' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?