Form of Nile river transport? (5)
I believe the answer is:
liner
'transport?' is the definition.
(liner is a kind of transport)
'form of nile river' is the wordplay.
'form of' indicates an anagram (the letters need to be in another 'form').
'river' becomes 'r'.
'nile' anagrammed gives 'line'.
'line'+'r'='LINER'
(Other definitions for liner that I've seen before include "Craft" , "It covers bin's interior" , "Seagoing vessel - goes with bin, eye or hard" , "may be demonstrated by make-up artist" , "Removable inner skin or large passenger ship" .)