One guarantees being cool and confident, right? (7)
I believe the answer is:
insurer
'one guarantees being' is the definition.
The definition suggests a singular noun which matches the answer.
'cool and confident right?' is the wordplay.
'cool' becomes 'in' (I've seen this in other clues).
'and' says to put letters next to each other.
'confident' becomes 'sure' ('sure' can be similar in meaning to 'confident').
'right?' becomes 'r' (common abbreviation).
'in'+'sure'+'r'='INSURER'
Can you help me to learn more?
(Other definitions for insurer that I've seen before include "Underwriter of risks" , "Underwriter, risk taker" , "Provider of cover" , "Company offering policies for premiums" , "one offers chance to cover" .)