Ready in the use of words, let fun out (6)
I believe the answer is:
fluent
'ready' is the definition.
(thesaurus)
'let fun out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'let'+'fun'='letfun'
'letfun' anagrammed gives 'FLUENT'.
'in the use of words' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for fluent that I've seen before include "Speaking or writing easily (in a language)" , "Fully competent in a language" , "Easily flowing" , "Easy, rapid (speech)" , "Flowing freely" .)