Heads for giant rollercoaster inducing panic? Hold tight (4)
I believe the answer is:
grip
'hold tight' is the definition.
(I've seen this in another clue)
'heads for giant rollercoaster inducing panic?' is the wordplay.
'heads for' indicates taking the first letters.
The first letters of 'giant rollercoaster inducing panic' is 'GRIP'.
(Other definitions for grip that I've seen before include "Take firm hold of travelling bag?" , "Clasp" , "Hold tightly in hand" , "Grasp securely" , "Hold tight" .)