Praise old charge being finally dropped (5)
I believe the answer is:
extol
'praise old charge' is the definition.
'extol' can be an answer for 'praise' (extolling is a kind of praising). I'm unsure of the 'old charge' bit.
'being finally dropped' is the wordplay.
'being' becomes 'ex' (ex is a kind of being).
'finally dropped' becomes 'tol' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ex'+'tol'='EXTOL'
Can you help me to learn more?
(Other definitions for extol that I've seen before include "Glorify - honour" , "Highly rate" , "'Praise, glorify (5)'" , "Crack up" , "Speak highly" .)