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Heyday of veteran in biology classes (6,3)

Ross

I believe the answer is:

golden era

'heyday' is the definition.
(I've seen this in another clue)

'veteran in biology classes' is the wordplay.
'veteran' becomes 'old' (I've seen this in another clue).
'in' is an insertion indicator.
'biology classes' becomes 'genera' (I've seen this in another clue).
'old' placed within 'genera' is 'GOLDEN ERA'.

'of' acts as a link.

I've seen this clue in The Times and The Sunday Times.
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