Natural history man on TV may be mad, bad, lively (5,7)

I believe the answer is:

david bellamy

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'natural history man on tv' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'may be mad bad lively' is the wordplay.
'may be' is an anagram indicator.
'mad'+'bad'+'lively'='madbadlively'
'madbadlively' with letters rearranged gives 'DAVID BELLAMY'.

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