Weak with emotional strain? Not the first aspect (9)
I believe the answer is:
dimension
'aspect' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'weak with emotional strain? not the first' is the wordplay.
'weak' becomes 'dim' (I can't explain this - if you can you should give a lot more credence to this answer).
'with' is a charade indicator (letters next to each other).
'emotional strain?' becomes 'tension' (I've seen this before).
'not the first' means to remove the first letter.
'tension' with its initial letter taken off is 'ension'.
'dim'+'ension'='DIMENSION'
Can you help me to learn more?
(Other definitions for dimension that I've seen before include "Proportion" , "Length or breadth, say" , "size" , "measure" .)