Swear word from husband on go-kart at regular intervals (4)
I believe the answer is:
oath
'swear word' is the definition.
(I've seen this before)
'husband on go-kart at regular intervals' is the wordplay.
'husband' becomes 'h' (abbreviation).
'on' means one lot of letters go next to another.
'at regular intervals' indicates alternate letters.
'go'+'kart'='gokart'
The alternate letters of 'gokart' are 'oat'.
'h' put after 'oat' is 'OATH'.
'from' is the link.
(Other definitions for oath that I've seen before include "in court, we take it" , "Vow or expletive" , "Curse or solemn word" , "One sworn" , "Swear word" .)