Latch that is about right (7)
I believe the answer is:
ethical
'right' is the definition.
(similar in meaning)
'latch that is about' is the wordplay.
I cannot quite see how this works, but
'about' could be 'ca' (abbreviation for 'circa') and 'ca' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for ethical that I've seen before include "Moral, honest" , "Moral, principled" , "not advertised to the general public" , "Morally correct, honourable" , "Morally good or correct" .)