Husband having no weapons in safe (8)
I believe the answer is:
harmless
'safe' is the definition.
(similar in meaning)
'husband having no weapons in' is the wordplay.
'husband' becomes 'h'.
'having no' becomes 'les' (I can't justify this - if you can you should believe this answer much more).
'weapons' becomes 'arms' ('arm' can be a synonym of 'weapon').
'in' indicates putting letters inside.
'les' going inside 'arms' is 'armless'.
'h'+'armless'='HARMLESS'
Can you help me to learn more?
(Other definitions for harmless that I've seen before include "Not injurious" , "Innocuous, innocent" , "Not likely to cause damage" , "Causing no damage" , "Benign, innocuous" .)