I learnt to be confident (7)
I believe the answer is:
reliant
'confident' is the definition.
(thesaurus)
'i learnt to be' is the wordplay.
'to be' is an anagram indicator.
'i'+'learnt'='ilearnt'
'ilearnt' anagrammed gives 'RELIANT'.
(Other definitions for reliant that I've seen before include "needing help from others" , "Depending (upon)" , "Dependent (on person)" , "leaning" , "Trusting" .)