Crazy fish leaping up around right end of spar (7)
I believe the answer is:
yardarm
'spar' is the definition.
(thesaurus)
'crazy fish leaping up around right end' is the wordplay.
I cannot quite see how this works, but
'right' could be 'ar' (I've seen this in other clues) and 'ar' is present in the answer.
This explanation may well be incorrect...
'of' is the link.
Can you help me to learn more?
(Other definitions for yardarm that I've seen before include "half of a ship's spar" , "place of naval execution" , "End of spar on ship's mast" , "End of mast's beam" , "Tapering end of beam hung on mast" .)