Early airman who became unstuck (6)
I believe the answer is:
icarus
'early airman' is the definition.
The definition suggests a singular noun which matches the answer.
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for icarus that I've seen before include "Greek mythical youth who flew too close to the sun" , "who made unwise flight?" , "Unfortunate high-flier in Greek mythology" , "Ill-fated son of Daedalus" , "He died flying" .)