Husband gets bull with a deception (4)
I believe the answer is:
hoax
'deception' is the definition.
(hoax is a kind of deception)
'husband gets bull with a' is the wordplay.
'husband' becomes 'h'.
'gets' means one lot of letters go next to another.
'bull' becomes 'ox'.
'with' is an insertion indicator.
'ox' enclosing 'a' is 'oax'.
'h'+'oax'='HOAX'
(Other definitions for hoax that I've seen before include "Prank" , "Fake, such as Piltdown Man" , "Humorous or malicious deception" , "Fool" , "A plan to deceive" .)