Have supper then come over and hang around. It's a doddle! (8)
I believe the answer is:
pushover
'have supper then come' is the definition.
I can't judge whether this definition defines the answer.
'over and hang around it's a doddle' is the wordplay.
'and' says to put letters next to each other.
'hang' becomes 'suspend' (suspend can mean to hang or swing).
'around' means to look at the middle letters.
'it's a doddle' becomes 'ush' (I can't explain this - if you can you should give a lot more credence to this answer).
The centre of 'suspend' is 'p'.
'p'+'ush'='push'
'over' put after 'push' is 'PUSHOVER'.
Can you help me to learn more?
(Other definitions for pushover that I've seen before include "Something easily done" , "breeze" , "Easy victim" , "customer offering little resistance" , "picnic" .)