Evaluation of framework of metal bars: not good (6)
I believe the answer is:
rating
'evaluation' is the definition.
(I know that evaluation can be written as rating)
'framework of metal bars not good' is the wordplay.
I cannot quite understand how this works, but
'metal' could be 'ti' (Ti is an example) and 'ti' is present in the answer.
'good' could be 'g' (abbreviation) and 'g' is present in the answer.
The remaining letters 'ran' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'of' is the link.
Can you help me to learn more?
(Other definitions for rating that I've seen before include "Classification - or a non-com sailor" , "Non-commissioned sailor - classification" , "Tar gin for a class of sailor" , "Angry reprimand for non-commissioned sailor?" , "Classification assigned to person as, say, for income" .)