Pelican allowed part in channel (5)
I believe the answer is:
canal
'channel' is the definition.
(I know that canal is a type of channel)
'pelican allowed part in' is the wordplay.
'in' indicates a hidden word.
'CANAL' can be found hidden inside 'pelican allowed part'.
(Other definitions for canal that I've seen before include "Long, narrow strip of water" , "eg Grand Union" , "Inland waterway" , "Aqueduct" , "Grand Union perhaps" .)