Live with dad originally in good health (5)
I believe the answer is:
dwell
'live' is the definition.
(to live/dwell somewhere)
'with dad originally in good health' is the wordplay.
'with' means one lot of letters go next to another.
'originally' suggests taking the first letters.
'in good health' becomes 'well' (similar in meaning).
The first letter of 'dad' is 'd'.
'd'+'well' is 'DWELL'.
(Other definitions for dwell that I've seen before include "Settle" , "Think moodily (on something)" , "Focus attention (on)" , "Lodge" , "Abide, reside" .)