Gasp, in alarm, when they feature particular kind of column (6)
I believe the answer is:
spinal
'kind of column' is the definition.
(I've seen this in another clue)
'gasp in alarm when they feature particular' is the wordplay.
'SPINAL' is hidden within the letters.
But, I am uncertain how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for spinal that I've seen before include "affecting the back?" , "of a vital column" , "Plains (anag.)" , "sort of column" , "Type of column" .)