Do my best trick banishing boy's shyness (7)
I believe the answer is:
modesty
'shyness' is the definition.
(thesaurus)
'do my best trick banishing boy's' is the wordplay.
I cannot really see how this works, but
'boy's' could be 'odes' and 'odes' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for modesty that I've seen before include "Reserve" , "Self-deprecating quality" , "Decorum, shyness" , "Unassuming quality" , "Unpretentious style" .)