Lady starts to move about restlessly inside aeroplane (5)
I believe the answer is:
maria
'lady' is the definition.
(I've seen this before)
'starts to move about restlessly inside aeroplane' is the wordplay.
'starts to' says to take the initial letters.
The first letters of 'move about restlessly inside aeroplane' is 'MARIA'.
(Other definitions for maria that I've seen before include "Black --, -- Theresa" , "Woman" , "West Side Story girl" , "(Of plant) become limp" , "Lady" .)