One studying sun’s capturing carbon and hydrogen (7)
I believe the answer is:
scholar
'one studying' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'sun's capturing carbon and hydrogen' is the wordplay.
'sun's' becomes 'solar' (I've seen this before).
'capturing' is an insertion indicator.
'carbon' becomes 'C' (C is the chemical symbol for carbon).
'and' means one lot of letters go next to another.
'hydrogen' becomes 'H' (H is the chemical symbol for hydrogen).
'c'+'h'='ch'
'solar' enclosing 'ch' is 'SCHOLAR'.
Can you help me to learn more?
(Other definitions for scholar that I've seen before include "Learned type" , "Subject of poem by 1 across" , "Learned (or learning) one" , "Man of letters" , "Pupil - erudite person" .)