Engineers, male, with new worker finding scrap (7)
I believe the answer is:
remnant
'scrap' is the definition.
(synonyms)
'engineers male with new worker' is the wordplay.
'engineers' becomes 're' (Royal Engineers).
'male' becomes 'm' (common abbreviation).
'with' means one lot of letters go next to another.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'worker' becomes 'ant' (worker is a type of ant).
're'+'m'+'n'+'ant'='REMNANT'
'finding' acts as a link.
(Other definitions for remnant that I've seen before include "Oddment, leftover piece, perhaps of material" , "Piece or people left over" , "offcut" , "Residue" , "Piece of cloth left over" .)