Oh dear: I was only doing a bit of research re Manehi’s query re ‘addle’ meaning ‘bad’. I didn’t know it as an adjective before and was therefore interested to find it could be. [I personally don't even use 'addled' overmuch these days!]

I think I’ve said before that I’d forgive Arausaria anything – and I defy anyone to come up with an alternative clue for ‘fiddle-faddle’ -but I guess even the solution’s archaic for some!

I thought this was a charming puzzle!

The above definition is from OED – more fully:
adj. as in Addle-egg [Romeo and Juliet III i 25
‘as addle as an egg for quarrelling’; Dryden; ‘his brains grow addle’, etc.

I’d never heard of ‘replevy’, either!

The Gironde is the estuary of the Dordogne and GARONNE, which, of course, would also fit, were it not for the anagram of ‘eroding’! [I remember coming across this double possibility in an Araucaria puzzle before.]
Stan and Andrew’s explanation seems feasible to me, together with perhaps the fact that the area doesn’t import much!

ADDLE is interesting: it can be a noun – ‘stinking urine or liquid filth’, an adjective – ‘rotten or putrid’, or a verb – ‘to confuse or make abortive’, hence the Addled Parliament of James I and VI in 1614, so called because it achieved nothing [the only context in which I'd met it before].