Some draw a complete blank, turning it into something to chew on (5)
I believe the answer is:
betel
'it into something to chew on' is the definition.
The definition suggests a singular noun which matches the answer.
'some draw a complete blank turning' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'turning' shows that the letters should be reversed in order.
'leteb' is hidden in the letters of 'draw complete blank'.
'leteb' in reverse letter order is 'BETEL'.
Can you help me to learn more?
(Other definitions for betel that I've seen before include "Palm with leaf and nuts chewed" , "leaves to chew" , "Palm with nuts for chewing" , "Narcotic leaf" , "Something stimulating" .)