It is weighed by a craftsman (6)
I believe the answer is:
anchor
'craftsman' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?
'it is weighed by a' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for anchor that I've seen before include "Ship's brake" , "Drop this at sea" , "Fix firmly and stably" , "Last runner in relay race team" , "It prevents a vessel from moving" .)