Looks like one is not fit to be worthy of attention (7)
I believe the answer is:
notable
'be worthy of attention' is the definition.
(I've seen this before)
'looks like one is not fit' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'a' (a thing is one thing) and 'a' is present in the answer.
'not' could be 'no' (negative) and 'no' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'to' is the link.
Can you help me to learn more?
(Other definitions for notable that I've seen before include "Unusual" , "Worth remembering" , "Prominent" , "Worthy of attention, significant" , "Outstanding" .)