Fugitive American breaching part of airport (7)
I believe the answer is:
runaway
'fugitive' is the definition.
(synonyms)
'american breaching part of airport' is the wordplay.
I cannot quite see how this works, but
'american' could be 'a' (common abbreviation - e.g. in organisation names) and 'a' is found within the answer.
'part' could be 'way' (way is a kind of part) and 'way' is present in the answer.
The remaining letters 'run' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for runaway that I've seen before include "Del Shannon hit" , "refugee?" , "scooter?" , "desert" , "Absconder" .)