One hundred dance moves with Spain’s rhythms (8)
I believe the answer is:
cadences
'rhythms' is the definition.
(cadence is a kind of rhythm)
'one hundred dance moves with spain's' is the wordplay.
'one hundred' becomes 'c' (roman numeral).
'moves' indicates anagramming the letters.
'with' says to put letters next to each other.
'spain's' becomes 'es' (abbreviation for Espana).
'dance' anagrammed gives 'adenc'.
'c'+'adenc'+'es'='CADENCES'
(Other definitions for cadences that I've seen before include "rhythmic beats" , "Rises and falls of voice in speaking" , "Modulations or inflections of the voice" .)