Instrument making comeback in Bratislava (5)
I believe the answer is:
sitar
'instrument' is the definition.
(musical instrument)
'comeback in bratislava' is the wordplay.
'comeback' says the letters should be written backwards.
'in' indicates a hidden word.
'ratis' is hidden within 'bratislava'.
'ratis' in reverse letter order is 'SITAR'.
'making' is the link.
(Other definitions for sitar that I've seen before include "Indian string instrument" , "Large Indian lute" , "Long-necked musical instrument of India" , "Long necked and often plucked" , "Indian musical instrument like long-necked lute" .)