Wonderful barracker thanks Saint in charge (9)
I believe the answer is:
fantastic
'wonderful' is the definition.
(I know that wonderful can be written as fantastic)
'barracker thanks saint in charge' is the wordplay.
'barracker thanks' becomes 'fanta' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'saint' becomes 'st' (abbreviation).
'in charge' becomes 'ic' (abbreviation for 'in charge').
'fanta'+'st'+'ic'='FANTASTIC'
Can you help me to learn more?
(Other definitions for fantastic that I've seen before include "Splendid, amazing" , "Wild" , "Extraordinarily good, tremendous" , "Brilliant or unbelievable" , "Illusory - excellent!" .)