Last four......
26 ac : Woman spoils husband:starting point for anniversary
(6) -a---a
45d : A study written up about unknown soldiers down
under (6) -n-a-s
And wordplay for these two :
8 d : Carefully inspected chap's head regularly (5) c-s-d
(presumably "cased" - but why?)
11d : They copy Monet's first two pieces with endless artistic bent (9) i-i-a-o-- ( "imitators" - but why?)
Thanks in advance!