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Heatwave from host releasing sulphur hex (3,5)

Ross

I believe the answer is:

hot spell

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'heatwave' is the definition.
I can't tell whether this defines the answer.

'host releasing sulphur hex' is the wordplay.
'releasing' is a deletion indicator.
'sulphur' becomes 'S' (synonyms).
'hex' becomes 'spell' (spelling is a kind of hexing).
'host' with 's' removed is 'hot'.
'hot'+'spell'='HOT SPELL'

'from' acts as a link.

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