Suspect ponders answer (7)
I believe the answer is:
'answer' is the definition.
(I know that answer can be written as respond)
'suspect ponders' is the wordplay.
'suspect' is an anagram indicator (a suspicious or unusual spelling).
'ponders' anagrammed gives 'RESPOND'.
(Other definitions for respond that I've seen before include "React (positively) to a stimulus or treatment" , "Answer or react" , "Come back" , "Reply - react" , "Write back" .)