Blast from modern radio echoing (4)
I believe the answer is:
darn
'blast' is the definition.
(thesaurus)
'from modern radio echoing' is the wordplay.
'from' indicates the answer is hidden within the clue.
'echoing' shows that the letters should be reversed in order (echo can mean to reflect or bounce back).
'nrad' is hidden within 'modern radio'.
'nrad' back-to-front is 'DARN'.
(Other definitions for darn that I've seen before include "Mend by stitching - damn!" , "Mend with a needle" , "Blow" , "Sew" , "Repair with wool" .)