Remove sketch after humour shown by husband (8)
I believe the answer is:
withdraw
'remove' is the definition.
(withdrawing is a kind of removing)
'sketch after humour shown by husband' is the wordplay.
'sketch' becomes 'draw' (I've seen this before).
'after' means one lot of letters go next to another.
'humour' becomes 'wit' ('wit' can be a synonym of 'humour'**).
'shown by' means one lot of letters go next to another.
'husband' becomes 'h'.
'wit'+'h'='with'
'draw' after 'with' is 'WITHDRAW'.
(Other definitions for withdraw that I've seen before include "Take, go, back" , "Take money out of a bank account" , "Bow out, retreat" , "Recall" , "depart?" .)