Crossword Genius

We must be engulfed in sadness: that’s amazing! (5)

Ross

I believe the answer is:

wowee

'that's amazing' is the definition.
(expression of surprise)

'we must be engulfed in sadness' is the wordplay.
'must be engulfed in' indicates putting letters inside.
'sadness' becomes 'woe' (woe is a kind of sadness).
'we' inserted into 'woe' is 'WOWEE'.

I've seen this clue in The Times.
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