Rich wife well having lost first husband (7)
I believe the answer is:
wealthy
'rich wife well having lost first husband' is the definition.
I can't tell whether this defines the answer.
'rich wife well having lost first husband' is the wordplay.
'rich wife' becomes 'w' (abbreviation. I am not sure about the 'rich' bit.).
'well' becomes 'healthy' (associated in meaning).
'having lost' is a deletion indicator.
'first husband' becomes 'h' (wst letter of 'husband').
'healthy' with 'h' taken out is 'ealthy'.
'w'+'ealthy'='WEALTHY'
Can you help me to learn more?
(Other definitions for wealthy that I've seen before include "Affluent" , "Rich and prosperous" .)