Army chaplain dwelling with Royal Engineers (5)
I believe the answer is:
padre
'army chaplain' is the definition.
(I've seen this in another clue)
'dwelling with royal engineers' is the wordplay.
'dwelling with' becomes 'pad' (I can't justify this - if you can you should believe this answer much more).
'royal engineers' becomes 'RE' (abbreviation).
'pad'+'re'='PADRE'
Can you help me to learn more?
(Other definitions for padre that I've seen before include "A military clergyman" , "Priest, chaplain" , "Services' chaplain" , "Man of god - drape (anag)" , "Military chaplain" .)