Crossword Genius

Heavy weight is in wood floor (8)

Ross

I believe the answer is:

astonish

'floor' is the definition.
(I've seen this in another clue)

'heavy weight is in wood' is the wordplay.
'heavy weight' becomes 'ton' (a ton weighs a lot).
'in' means one lot of letters goes inside another.
'wood' becomes 'ash' (wood from an ash tree).
'ton'+'is'='tonis'
'tonis' inserted inside 'ash' is 'ASTONISH'.

(Other definitions for astonish that I've seen before include "Stun" , "are staggering" , "Startle" , "Floor" , "Gobsmack" .)

I've seen this clue in The Sun.
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