Careless husband unhappy with chums all coming round (8)
I believe the answer is:
slapdash
'careless' is the definition.
(similar in meaning)
'husband unhappy with chums all coming round' is the wordplay.
'husband' becomes 'h' (abbreviation).
'unhappy' becomes 'sad' (associated in meaning).
'with' says to put letters next to each other.
'chums all' becomes 'pals' (I can't justify this - if you can you should believe this answer much more).
'coming round' says the letters should be written backwards.
'h'+'sad'+'pals'='hsadpals'
'hsadpals' backwards is 'SLAPDASH'.
Can you help me to learn more?
(Other definitions for slapdash that I've seen before include "recklessly" , "Slipshod, careless" , "Irresponsible" , "Careless - slack" , "Quick, careless" .)