Counter where person tossed pennies (7)
I believe the answer is:
respond
'counter' is the definition.
(I've seen this in another clue)
'person tossed pennies' is the wordplay.
'tossed' indicates an anagram.
'pennies' becomes 'd' (abbreviation e.g. Lsd - pounds, shillings, pence).
'person' is an anagram of 'respon'.
'respon'+'d'='RESPOND'
'where' acts as a link.
(Other definitions for respond that I've seen before include "Write back" , "Answer back" , "React (positively) to a stimulus or treatment" , "Answer or react" , "State in reply" .)