Fred Astaire, e.g. (3,6)

I believe the answer is:

sea urchin

(Other definitions for sea urchin that I've seen before include "Marine invertebrate - enrich USA (anag)" , "spineless creature" , "Main thing" , "Marine invertebrate with spikes" , "A problem for barefoot dabblers" .)

I've seen this clue in The Telegraph.

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