Glossier piece of beef? That's right! (7)

I believe the answer is:

shinier

'glossier' is the definition.
('shiny' can be a synonym of 'glossy')

'piece of beef? that's right' is the wordplay.
'piece of beef?' becomes 'shin' (shin is a cut of beef).
'that's' becomes 'ie' (abbreviation for 'id est', 'that is' in Latin).
'right' becomes 'r' (common abbreviation).
'shin'+'ie'+'r'='SHINIER'

I've seen this clue in the Sydney Morning Herald.

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