Place in which insect gets end away (5)
I believe the answer is:
locus
'place' is the definition.
(thesaurus)
'insect gets end away' is the wordplay.
'insect' becomes 'locust' (locust is a kind of insect).
'gets end away' means to remove the last letter (I've seen 'getting end away' mean this).
'locust' with its final letter taken away is 'LOCUS'.
'in which' acts as a link.
(Other definitions for locus that I've seen before include "Position, point, place" , "line" , "Particular place something is found" , "Area of" , "insect" .)