Channel in Australia is legendary (5)
I believe the answer is:
aisle
'channel' is the definition.
(I've seen this before)
'in australia is legendary' is the wordplay.
'in' indicates a hidden word.
'AISLE' is hidden within 'australia is legendary'.
(Other definitions for aisle that I've seen before include "Church walkway" , "way for prospective union members?" , "Passageway in church as for bride" , "'Passage, gangway (5)'" , "Divide in a church" .)