Frank abandoning house and home (4)
I believe the answer is:
nest
'home' is the definition.
(a bird's home)
'frank abandoning house and' is the wordplay.
I cannot really understand how this works, but
'and' could be 'n' (common abbreviation for 'and') and 'n' is present in the answer.
The remaining letters 'est' 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?
(Other definitions for nest that I've seen before include "Bird's house" , "Sent to bird's home" , "Eyrie" , "Place to lay eggs" , "Structure built by birds" .)