Each time essentially Austrian's combating Nadal, providing close set (5)
I believe the answer is:
radio
'set' is the definition.
(radio is a kind of set)
'each time essentially austrian's combating nadal providing close' is the wordplay.
I cannot quite see how this works, but
'time' could be 'ad' and 'ad' is found in the answer.
The remaining letters 'rio' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
(Other definitions for radio that I've seen before include "Electronic receiver" , "send a message" , "Sound broadcasting" , "Broadcaster" , "Sound receiver" .)