Experience being trapped in unsafe elevator (4)
I believe the answer is:
feel
'experience' is the definition.
(feeling is a kind of experiencing)
'trapped in unsafe elevator' is the wordplay.
'trapped in' says the answer is hidden in the clue.
'FEEL' can be found hidden inside 'unsafe elevator'.
'being' acts as a link.
(Other definitions for feel that I've seen before include "Sense or touch" , "16A [JUDGE]" , "Have sensation of" , "Have a belief; touch" , "Leg (of mutton/lamb)" .)