When a girl gets to tango, there's buoyant rhythm (4)
I believe the answer is:
lilt
'rhythm' is the definition.
(lilt is a kind of rhythm)
'when a girl gets to tango there's buoyant' is the wordplay.
I cannot quite see how this works, but
'girl' could be 'lil' and 'lil' is located in the answer.
'tango' could be 't' (phonetic alphabet: alpha, bravo, charlie etc.) and 't' is present in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for lilt that I've seen before include "Cadence (in speech)" , "Jaunty musical rhythm" , "Pleasant gentle accent" , "Sing happily" , "Swing - rhythm" .)