Crossword Genius

Engineers fathom echo (7)

Ross

I believe the answer is:

resound

'echo' is the definition.
('resound' can be a synonym of 'echo')

'engineers fathom' is the wordplay.
'engineers' becomes 're' (Royal Engineers).
'fathom' becomes 'sound' ('sound' can be a synonym of 'fathom').
're'+'sound'='RESOUND'

(Other definitions for resound that I've seen before include "Reverberate" , "Echo" , "ring" .)

I've seen this clue in The Telegraph.
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