Amphibian, for example, at lake demonstrates this to some extent (9)

I believe the answer is:

toadegree

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'amphibian for example at lake demonstrates' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'to some extent' is the wordplay.
'some' becomes 'a'.
'extent' becomes 'degree' (I've seen this in another clue).
'to'+'a'+'degree'='TOADEGREE'

'this' acts as a link.

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I've seen this clue in The Irish Times.

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