Attack and do as ordered, beset by girl getting married (9)
I believe the answer is:
broadside
'attack' is the definition.
(broadside is a kind of attack)
'do as ordered beset by girl getting married' is the wordplay.
'ordered' indicates an anagram.
'beset by' is an insertion indicator ('beset' could historically mean 'cover').
'girl getting married' becomes 'bride'.
'do'+'as'='doas'
'doas' with letters rearranged gives 'oads'.
'oads' put into 'bride' is 'BROADSIDE'.
'and' is the link.
(Other definitions for broadside that I've seen before include "Stick" , "Fierce verbal attack" , "Strongly critical verbal attack" , "Strong verbal attack on sideboard" , "Full weight of (ship's) fire" .)