Put on guard from a combination of fear and wonder (10)
I believe the answer is:
forewarned
'put on guard from a' is the definition.
I can't tell whether this definition defines the answer.
'combination of fear and wonder' is the wordplay.
'combination of' indicates an anagram (I've seen this in other clues).
'and' means one lot of letters go next to another.
'fear' after 'wonder' is 'wonderfear'.
'wonderfear' anagrammed gives 'FOREWARNED'.
Can you help me to learn more?
(Other definitions for forewarned that I've seen before include "Not taken by surprise" , "Given advanced notice" .)