Silly dope it's wrong to put down (7)
I believe the answer is:
deposit
'put down' is the definition.
(I've seen this before)
'silly dope it's wrong' is the wordplay.
'silly' indicates anagramming the letters.
'wrong' is an anagram indicator.
'dope' with letters rearranged gives 'depo'.
'its' anagrammed gives 'sit'.
'depo'+'sit'='DEPOSIT'
'to' is the link.
(Other definitions for deposit that I've seen before include "store" , "Down-payment" , "First instalment" , "Precipitate" , "Hoard" .)