Some gas wanted for city near Lake Nasser (5)
I believe the answer is:
aswan
'city near lake nasser' is the definition.
(I've seen this in another clue)
'some gas wanted for' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'ASWAN' is hidden in the letters of 'gas wanted for'.
(Other definitions for aswan that I've seen before include "Egyptian town and dam" , "Site of dam in Egypt" , "Egyptian city and dam" , "Nile High Dam" , "Ancient city on the Nile" .)