Tease troops getting married in tent (7)
I believe the answer is:
torment
'tease' is the definition.
(I've seen this before)
'troops getting married in tent' is the wordplay.
'troops' becomes 'or' (military abbreviation for other ranks).
'getting' says to put letters next to each other.
'married' becomes 'm'.
'in' is an insertion indicator.
'or'+'m'='orm'
'orm' put within 'tent' is 'TORMENT'.
(Other definitions for torment that I've seen before include "Agony of mind" , "Cause great pain to" , "Physical or mental pain" , "Great agony" , "Severe pain" .)