Suggestion made by husband in jest, ultimately (4)
I believe the answer is:
hint
'suggestion' is the definition.
(hint is a kind of suggestion)
'husband in jest ultimately' is the wordplay.
'husband' becomes 'h'.
'ultimately' indicates one should take the final letters.
The final letter of 'jest' is 't'.
'h'+'in'+'t'='HINT'
'made by' is the link.
(Other definitions for hint that I've seen before include "signal" , "Helpful suggestion" , "suspicion" , "Imply, suggest" , "Clue - soupcon" .)