Sodium smell beginning to appear (7)
I believe the answer is:
nascent
'beginning to appear' is the definition.
I can't judge whether this defines the answer.
'sodium smell' is the wordplay.
'sodium' becomes 'NA' (chemical symbol).
'smell' becomes 'scent' (scent is a kind of smell).
'na'+'scent'='NASCENT'
Can you help me to learn more?
(Other definitions for nascent that I've seen before include "Beginning to show signs of potential" , "Coming alive" , "Emerging, in the process of being born" , "Beginning to develop, embryonic" , "being developed" .)