Crossword Genius

Father is brought back by engineers (4)

Ross

I believe the answer is:

sire

'father' is the definition.
(I know that father can be written as sire)

'is brought back by engineers' is the wordplay.
'brought back' says the letters should be written backwards.
'by' is a charade indicator (letters next to each other).
'engineers' becomes 're' (abbreviation for Royal Engineers).
'is' written backwards gives 'si'.
'si'+'re'='SIRE'

(Other definitions for sire that I've seen before include "Make children" , "Old form of address to king - rise to it" , "Bear" , "Ancestor" , "Generator" .)

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