Struggled a bit with this, but with the help of the forum I've now just got 4 to solve, 2 interlocking pairs:
1d and 9a, 5d and 13a.
Any gentle hints would be much appreciated.
I've seen hints about "cut e" for 5, but no penny has dropped. No-one else seems to have mentioned the other 3: I've got unusual last letter "a" for 9, but am confident about 2d (especially since posts here explained the "Police chief" element!). 1d presumably involves a "my" or an "i", perhaps "id", but I can't see it.
FOI was 25, as for many people.
LOI will be one of the 4 abovementioned.
Never heard of 18a, had to resort to Wikipedia's list of Norwegian musicians to work out the anagram.