Crossword Genius

Lass admits heart-throb is a tool (6)

Ross

I believe the answer is:

wrench

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'tool' is the definition.
(wrench is a kind of tool)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for wrench that I've seen before include "Violent twist or pull" , "Violent twist - (adjustable) spanner" , "Sprain; spanner" , "Painful parting" , "Sort of spanner - twist it" .)

I've seen this clue in the Sydney Morning Herald.
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