Drake versus duck with a grey cast? (7)
I believe the answer is:
voyager
'drake' is the definition.
(Sir Francis Drake is an example)
'versus duck with a grey cast?' is the wordplay.
'versus' becomes 'v'.
'duck' becomes 'o'.
'with' is an insertion indicator.
'cast?' indicates an anagram (I've seen 'casting' mean this).
'grey' anagrammed gives 'yger'.
'a' going inside 'yger' is 'yager'.
'v'+'o'+'yager'='VOYAGER'
(Other definitions for voyager that I've seen before include "Person making a journey on water or in space" , "Traveler to a distant land" , "One on a long journey" , "Sea or space traveller" , "Traveller to a distant land" .)