Steps in dances (8)
I believe the answer is:
measures
This clue is a double definition.
'steps' is the first definition.
('measure' can be a synonym of 'step')
'dances' is the second definition.
(I've seen this before)
'in' is the link.
(Other definitions for measures that I've seen before include "Ascertains the size, of dances?" , "Steps" , "Determine the dimensions" , "Ascertains the quantity, extent etc." , "Ascertains the dimensions" .)