Conspiracy to get aviator out of India (4)
I believe the answer is:
plot
'conspiracy' is the definition.
(a conspiracy is a secret plot)
'aviator out of india' is the wordplay.
'aviator' becomes 'pilot' (pilot is a kind of aviator).
'out of' is a deletion indicator.
'india' becomes 'i' (phonetic alphabet: alpha, bravo, charlie etc.).
'pilot' with 'i' removed is 'PLOT'.
'to get' acts as a link.
(Other definitions for plot that I've seen before include "Secret scheme or plan" , "Area of ground; storyline" , "bed" , "Story or piece of land" , "Connive" .)