Every husband-to-be initially ignored marriage? (8)
I believe the answer is:
alliance
'marriage?' is the definition.
(I've seen this before)
'every husband-to-be initially ignored' is the wordplay.
'every' becomes 'all' (similar in meaning).
'husband-to-be' becomes 'fiance' (I've seen this in another clue).
'initially ignored' means to remove the first letter.
'fiance' with its first letter taken off is 'iance'.
'all'+'iance'='ALLIANCE'
(Other definitions for alliance that I've seen before include "Marriage - union" , "A joining of forces" , "The joining by political agreement or treaty" , "Coalition or union" , "Bond" .)