Give an appraisal of Jenny? (6)
I believe the answer is:
assess
'give an appraisal of jenny?' is the definition.
I can't judge whether this definition defines the answer.
'of jenny?' is the wordplay.
I cannot really understand how this works, but
'jenny?' could be 'ass' (jenny is a female ass) and 'ass' is present in the answer.
The remaining letters 'ess' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for assess that I've seen before include "Estimate value (for tax)" , "Remedy for all ills" , "Gauge, evaluate" , "Reckon value" , "'Evaluate, appraise (6)'" .)