Plane detailed to carry peacekeepers for a month (4)
I believe the answer is:
june
'month' is the definition.
(I know that June is a type of Gregorian calendar month)
'plane detailed to carry peacekeepers' is the wordplay.
'plane' becomes 'jet' (jet plane).
'detailed' means to remove the last letter (the word must be end-less or 'de-tailed').
'to carry' means one lot of letters goes inside another.
'peacekeepers' becomes 'UN' (United Nations, peacekeeping organisation).
'jet' with its final letter taken away is 'je'.
'je' placed around 'un' is 'JUNE'.
'for a' acts as a link.
(Other definitions for june that I've seen before include "Spring/summer month" , "Month named after Jupiter's wife" , "The "flaming" month?" , "Sixth month" , "Month after 14" .)