Royal Engineers handle move back (7)

I believe the answer is:

retreat

'move back' is the definition.
(synonyms)

'royal engineers handle' is the wordplay.
'royal engineers' becomes 'RE' (abbreviation).
'handle' becomes 'treat' (synonyms).
're'+'treat'='RETREAT'

(Other definitions for retreat that I've seen before include "Take flight" , "concession" , "hermitage, perhaps" , "What cowards might do" , "Go back" .)

I've seen this clue in The Sun.

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