Old money batters! (6)
I believe the answer is:
pounds
'old money batters' is the definition.
The answer and definition can be both to do with contact as well as being verbs in their -s form.
Maybe there's an association between them I don't understand?
'money batters' is the wordplay.
'money' becomes 'pound' (I've seen this before).
'batters' becomes 's' (I am not sure about this - if you are sure you should believe this answer much more).
'pound'+'s'='POUNDS'
Can you help me to learn more?
(Other definitions for pounds that I've seen before include "Imperial units of weight" , "Strikes; money" , "Sterling units of money or weights" , "Enclosures for dogs and cars" , "Sterling units or imperial weights" .)