Crossword Genius

Is of use when lava is erupting (6)

Ross

I believe the answer is:

avails

'is of use' is the definition.
(I've seen this before)

'lava is erupting' is the wordplay.
'erupting' is an anagram indicator.
'lava'+'is'='lavais'
'lavais' anagrammed gives 'AVAILS'.

'when' is the link.

(Other definitions for avails that I've seen before include "Is of profit, helps" , "Takes advantage of or benefits from" , "Makes use of saliva" .)

I've seen this clue in The Globe and Mail.
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