Struggle has student escape (6)
I believe the answer is:
flight
'escape' is the definition.
(synonyms)
'struggle has student' is the wordplay.
I cannot really understand how this works, but
'student' could be 'l' (as in L-plates for learner drivers) and 'l' is present in the answer.
'struggle' could be 'fight' (synonyms) and 'fight' is found in the remaining letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for flight that I've seen before include "the vanquished may take?" , "The feathers on a dart or arrow" , "Attachment to missile < part of Air Force" , "Tail of an arrow or dart" , "Movement through the air" .)