Person trying really hard riddle? (8)
I believe the answer is:
strainer
'riddle?' is the definition.
(riddle is a kind of strainer)
'person trying really hard' is the wordplay.
I cannot really see how this works, but
'person' could be 'trainer' (trainer is a kind of person) and 'trainer' is found within the answer.
A single letter 's' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for strainer that I've seen before include "to collect leaves?" , "one that stretches?" , "Tea leaf remover" , "eg Colander" , "Kitchen utensil" .)