Frightful heat — lower where wild animals drink (5,4)

I believe the answer is:

water hole

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'wild animals drink' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'frightful heat lower' is the wordplay.
'frightful' is an anagram indicator (a frightful spelling).
'heat'+'lower'='heatlower'
'heatlower' with letters rearranged gives 'WATER-HOLE'.

'where' is the link.

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I've seen this clue in The Times.

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