Hi Cazzy,
I might be off the wall with this one but here goes.
NA AN BSA is an anagram of BANANAS.
In slang, if someone is BANANAS they are said to be LOOPY.
The way the clue is written it is all over the place which could be said to be LOOPY.
If I am incorrect, then I am loopy and the men with white coats are on their way!!!!
Blessings.