Husband gets in Dubonnet Red, crackers and nuts (5,3,4)
I believe the answer is:
round the bend
'nuts' is the definition.
(I've seen this before)
'husband gets in dubonnet red crackers' is the wordplay.
'husband' becomes 'h' (abbreviation).
'gets in' indicates putting letters inside.
'crackers' is an anagram indicator (informal term for mad).
'dubonnet'+'red'='dubonnetred'
'dubonnetred' with letters rearranged gives 'roundtebend'.
'h' inserted inside 'roundtebend' is 'ROUND THE BEND'.
'and' acts as a link.
(Other definitions for round the bend that I've seen before include "hidden from view?" , "Insane or very stupid (i)" , "Further along winding road" , "bats" , "Mad - crazy" .)