Crew visiting island by boat somehow reaching part of Canada (8)
I believe the answer is:
manitoba
'part of canada' is the definition.
('Manitoba' is part of 'canada')
'crew visiting island by boat somehow' is the wordplay.
'crew' becomes 'man' (I've seen this before**).
'visiting' means one lot of letters goes inside another.
'island' becomes 'i'.
'by' says to put letters next to each other.
'somehow' indicates an anagram.
'i' put after 'boat' is 'boati'.
'boati' with letters rearranged gives 'itoba'.
'man' going inside 'itoba' is 'MANITOBA'.
'reaching' acts as a link.
(Other definitions for manitoba that I've seen before include "State" , "Canadian territory" , "Strange boatman I find in Canada" , "Winnipeg area" , "northern territory" .)