Reddish-brown ape’s biting repelled salesman (7)

'reddish-brown' is the definition.

'ape's biting repelled salesman' is the wordplay.
'ape' becomes 'copy' (synonyms).
'biting' indicates putting letters inside (some letters bite or swallow others).
'repelled' says the letters should be written backwards.
'salesman' becomes 'rep' (sales rep).
'rep' back-to-front is 'per'.
'copy' going around 'per' is 'COPPERY'.