People giving up, heading from our IQ test, confused (8)
I believe the answer is:
quitters
'people giving up' is the definition.
'heading from our iq test confused' is the wordplay.
'heading from' means to remove the first letter (remove the letter which heads the word).
'confused' is an anagram indicator.
'our'+'iq'+'test'='ouriqtest'
'ouriqtest' with its initial letter removed is 'uriqtest'.
'uriqtest' anagrammed gives 'QUITTERS'.
(Other definitions for quitters that I've seen before include "Ex-smokers?" , "They give up easily, can't last the course" .)