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' is a charade indicator (letters next to each other).
'at regular intervals' indicates alternate letters.
'go'+'kart'='gokart'
The alternating letters of 'gokart' are 'oat'.
'h' after 'oat' is 'OATH'.
'from' acts as a 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" .)