Copying fine family silver cups (6)

I believe the answer is:

faking

'copying' is the definition.
(faking is a kind of copying)

'fine family silver cups' is the wordplay.
'fine' becomes 'f' (abbreviation e.g. condition of old coins, books).
'family' becomes 'kin' (synonyms).
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'cups' is an insertion indicator (inserted letters are held or cupped).
'kin' placed within 'ag' is 'aking'.
'f'+'aking'='FAKING'

(Another definition for faking that I've seen is " Counterfeiting, forging".)

I've seen this clue in The Guardian.

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