Fly close to ground in fighter jet, heading east (5)
I believe the answer is:
midge
'fly' is the definition.
(I've seen this before)
'close to ground in fighter jet heading east' is the wordplay.
'close to' indicates one should take the final letters (the close of something is the end).
'in' is an insertion indicator.
'fighter jet' becomes 'mig' (I am not sure about this - if you are sure you should believe this answer much more).
'heading east' becomes 'e' (abbreviation).
The last letter of 'ground' is 'd'.
'd' going into 'mig' is 'midg'.
'midg'+'e'='MIDGE'
Can you help me to learn more?
(Other definitions for midge that I've seen before include "Tiny swarming fly" , "Small flying insect" , "Tiny biting fly" , "Dipterous insect, in swarms by water" , "Be an obstacle" .)