Husband admitted to mistake about storm (7)
I believe the answer is:
typhoon
'storm' is the definition.
(typhoon is a kind of storm)
'husband admitted to mistake about' is the wordplay.
'husband' becomes 'h' (abbreviation).
'admitted to' is an insertion indicator.
'mistake' becomes 'typo' (typographical error).
'about' becomes 'on' (as in a book 'on' a certain topic).
'h' inserted into 'typo' is 'typho'.
'typho'+'on'='TYPHOON'
(Other definitions for typhoon that I've seen before include "Cyclonic sea storm" , "Storm, cyclone" , "Indian Ocean cyclone" , "Pacific tropical storm" , "Eastern tropical storm" .)