Re. 29D "Florida river beastie" Fl is the abbreviation for Florida (rather than "F") and "ea" (popular Scrabble word!)is river or running water.
But - can't justify "Clang" for 32A "Crane's noise is a complex tone" - I see Chamber's defines it as the noise a crane makes but why "complex tone"?
Under klang, Chambers says "sometimes clang". More likely to be clang, I should think, as there isn't an indication of a homophone. It's "crane's noise", rather then perhaps, sounds like a crane's noise