An element of jazz in ceilidh? (4)
I believe the answer is:
zinc
'an element' is the definition.
(zinc is a kind of element)
'of jazz in ceilidh?' is the wordplay.
'of' indicates the answer is hidden within the clue.
'ZINC' is hidden in the letters of 'jazz in ceilidh'.
(Other definitions for zinc that I've seen before include "Constituent of brass" , "White metallic element usedin alloys" , "Anti-corrosion agent" , "Blue-white metal" , "Metal used in brass" .)