The last to get a shift shows furtive manner (7)
I believe the answer is:
stealth
'furtive manner' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'the last to get a shift' is the wordplay.
'the last' can be anagrammed to 'STEALTH'.
However, I'm not sure how this is indicated.
'shows' acts as a link.
Can you help me to learn more?
(Other definitions for stealth that I've seen before include "underhand dealing" , "Cautious and surreptitious action or movement" , "Secretiveness, furtiveness" , "Low-visibility military technology" , "Unseen machination" .)