Echo sounded in blasts and backfires (10)

'backfires' is the definition.
('boomerang' can be a synonym of 'backfire')

'echo sounded in blasts' is the wordplay.
'echo' becomes 'e' (phonetic alphabet: alpha, bravo, charlie etc.).
'sounded' becomes 'rang' (ringing is a kind of sounding).
'in' means one lot of letters goes inside another.
'blasts' becomes 'booms' ('boom' can be a synonym of 'blast').
'e'+'rang'='erang'
'erang' inserted inside 'booms' is 'BOOMERANGS'.

'and' acts as a link.