Engineers answer judgement (10)
I believe the answer is:
resolution
'judgement' is the definition.
(thesaurus)
'engineers answer' is the wordplay.
'engineers' becomes 're' (Royal Engineers).
'answer' becomes 'solution' (synonyms).
're'+'solution'='RESOLUTION'
(Other definitions for resolution that I've seen before include "sorting out of problem" , "puts an end to discord" , "Firm decision" , "Timely statement of intent" , "Fixed determination" .)