Many a charge put on a member (6)
I believe the answer is:
legion
'many' is the definition.
(I've seen this before)
'a charge put on a member' is the wordplay.
'a charge' becomes 'ion' (an ion is a charged particle).
'put on' says to put letters next to each other (some letters go on or after others).
'a member' becomes 'leg' (member can mean a limb).
'ion' put after 'leg' is 'LEGION'.
(Other definitions for legion that I've seen before include "Military unit of ancient Rome" , "France has a foreign one" , "A great number in the Roman military unit" , "Roman military formation" , "Large unit of the old Roman army" .)