Seafaring nuts go canoeing (5-5)
I believe the answer is:
ocean-going
'seafaring' is the definition.
(thesaurus)
'nuts go canoeing' is the wordplay.
'nuts' indicates anagramming the letters (nuts can mean crazy).
'go'+'canoeing'='gocanoeing'
'gocanoeing' is an anagram of 'OCEAN-GOING'.
(Other definitions for ocean-going that I've seen before include "Suited to the high seas" , "Capable of crossing seas" , "Like large ships" .)