Watch showing seconds in useless jewelled semicircle (3)
I believe the answer is:
see
'watch' is the definition.
(see can mean to view or watch)
'seconds in useless jewelled semicircle' is the wordplay.
'seconds' becomes 's' (abbreviation).
'in useless jewelled semicircle' becomes 'ee' (I can't explain this - if you can you should believe this answer much more).
's'+'ee'='SEE'
'showing' is the link.
Can you help me to learn more?
(Other definitions for see that I've seen before include "... have interview with" , "Up-and-down motion" , "responsibility of a bishop" , "Bishops office" , "Witness; ensure" .)