Fear Hard Right, caught between two alternatives (6)
I believe the answer is:
horror
'fear' is the definition.
(I know that horror is a type of fear)
'hard right caught between two alternatives' is the wordplay.
'two alternatives' can mean two substitutions for 'alternative'.
'hard' becomes 'h' (abbreviation used in pencil classifications).
'right' becomes 'r' (abbreviation).
'caught between' means one lot of letters goes inside another (I've seen this in other clues).
'alternative' becomes 'or'.
'alternative' becomes 'or'.
'r' going within 'or' is 'orr'.
'h'+'orr'+'or'='HORROR'
(Other definitions for horror that I've seen before include "Shock; disgust" , "(Reaction to) dreadful thing or event" , "Intense and profound fear" , "Intense shock" , "Extreme fright and disgust" .)