Fully able, and loud with it (3)
I believe the answer is:
fit
'fully able' is the definition.
'fit' can be an answer for 'able' (similar in meaning). I am not sure about the 'fully' bit.
'loud with it' is the wordplay.
'loud' becomes 'f' (A musical term).
'with' is a charade indicator (letters next to each other).
'f'+'it'='FIT'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for fit that I've seen before include "Attractive" , "In good physical condition, healthy" , "Appropriate kind of convulsion" , "'Sudden attack, of coughing say (3)'" , "Suitable; in good health" .)