Rascal engineers ship to leave a mark (7)
I believe the answer is:
impress
'leave a mark' is the definition.
(I've seen this before)
'rascal engineers ship' is the wordplay.
'rascal' becomes 'imp' (synonyms).
'engineers' becomes 're' (Royal Engineers).
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'imp'+'re'+'ss'='IMPRESS'
'to' is the link.
(Other definitions for impress that I've seen before include "Wow" , "Make one's mark (on)" , "Make mark or pattern by applying pressure" , "Inspire - engrave" , "force to join navy?" .)