Full throttle? Nonsense! (3)
I believe the answer is:
rot
'nonsense' is the definition.
(rot can mean nonsense or rubbish)
'full throttle?' is the wordplay.
'ROT' is hidden in amongst the letters.
However, I'm not sure how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for rot that I've seen before include "Decompose; rubbish" , "Balderdash" , "Drivel" , "Decay, wither" , "Decay in grotesque way" .)