Sailor interrupts murder at home (7)
I believe the answer is:
habitat
'home' is the definition.
(thesaurus)
'sailor interrupts murder at' is the wordplay.
'sailor' becomes 'ab' (abbreviation for able seaman).
'interrupts' means one lot of letters goes inside another.
'murder' becomes 'hit' ('hit' can be a synonym of 'murder').
'ab' placed inside 'hit' is 'habit'.
'habit'+'at'='HABITAT'
(Other definitions for habitat that I've seen before include "Natural environment, plant or animal" , "place haunted" , "Living environment" , "(Organism's) natural home" , "Territory" .)