Some pelican allowed in channel (5)
I believe the answer is:
canal
'channel' is the definition.
(I know that channel can be written as canal)
'some pelican allowed in' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'CANAL' is hidden within 'pelican allowed in'.
(Other definitions for canal that I've seen before include "navigate this?" , "Man-made watercourse" , "Grand Union perhaps" , "Passage" , "Man-made strip of water" .)