Military plane almost came down, creating a problem for the head (8)
I believe the answer is:
migraine
'a problem for the head' is the definition.
(I've seen this before)
'military plane almost came down' is the wordplay.
'military plane' becomes 'mig' (fighter jet produced by Russian company MiG. I am not sure about the 'military' bit.).
'almost' means to remove the last letter (almost the whole word is kept).
'came down' becomes 'rained' (raining is a kind of coming down).
'rained' with its final letter removed is 'raine'.
'mig'+'raine'='MIGRAINE'
'creating' acts as a link.
Can you help me to learn more?
(Other definitions for migraine that I've seen before include "From mare gin I get a severe headache" , "A really bad headache" , "causing suffering?" , "may give one a sort of headache" , "Thumping headache" .)