Crossword Genius

Weight around a ton gives a measure of power (4)

Ross

I believe the answer is:

watt

'a measure of power' is the definition.
(unit of power)

'weight around a ton' is the wordplay.
'weight' becomes 'wt'.
'around' means one lot of letters goes inside another.
'ton' becomes 't' (abbreviation).
'wt' placed around 'a' is 'wat'.
'wat'+'t'='WATT'

'gives' is the link.

(Other definitions for watt that I've seen before include "man of power?" , "James -; Sc. engineer" , "Unit of electric power" , "SI unit of power" , "Unit of electricity" .)

I've seen this clue in The Guardian.
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