Step on the scale? (3)
I believe the answer is:
sol
'step on the scale?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sol that I've seen before include "Spanish and poetic sun" , "Personification of the sun" , "Musical note" , "Note; Peruvian currency" , "The Sun (or Campbell?)" .)