Crossword Genius

An explanation from engineers when working (6)

Ross

I believe the answer is:

reason

'an explanation' is the definition.
(reason is a kind of explanation)

'engineers when working' is the wordplay.
'engineers' becomes 're' (Royal Engineers).
'when' becomes 'as'.
'working' becomes 'on'.
're'+'as'+'on'='REASON'

'from' acts as a link.

(Other definitions for reason that I've seen before include "Employ logic" , "Sanity, the ability to think" , "Power of thought" , "Cause for sanity" , "Think in a logical way" .)

I've seen this clue in The Telegraph.
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