Officer getting place with leaseholder (10)
I believe the answer is:
lieutenant
'officer' is the definition.
(I know that lieutenant is a type of commissioned military officer)
'place with leaseholder' is the wordplay.
'place' becomes 'lieu' (as in the phrase 'in lieu of').
'with' says to put letters next to each other.
'leaseholder' becomes 'tenant' (I've seen this in another clue).
'lieu'+'tenant'='LIEUTENANT'
'getting' is the link.
(Other definitions for lieutenant that I've seen before include "Substitute" , "Assistant" , "e.g. one on French side who had a woman?" , "Army rank" , "Army officer" .)