Crossword Genius

Massive loss in the end, heavy defeat (8)

Ross

I believe the answer is:

stonking

'massive' is the definition.

'loss in the end heavy defeat' is the wordplay.
'in the end' indicates one should take the final letters.
'heavy defeat' becomes 'tonking' (informal term for a defeat eg in sport).
The final letter of 'loss' is 's'.
's'+'tonking'='STONKING'

(Another definition for stonking that I've seen is " Very large".)

I've seen this clue in The Times.
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