Innermost nature without love? Attempt to become passionate (6)
I believe the answer is:
sultry
'passionate' is the definition.
(I've seen this before)
'innermost nature without love? attempt' is the wordplay.
I cannot really understand how this works, but
'attempt' could be 'try' (synonyms) and 'try' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'to become' is the link.
Can you help me to learn more?
(Other definitions for sultry that I've seen before include "Sweltering - arousing passion" , "Humid and oppressive" , "Close -- sensual" , "Hot and steamy" , "Passionate" .)