Send message to workers making spectacles (8)
I believe the answer is:
pageants
'spectacles' is the definition.
(I've seen this before)
'send message to workers' is the wordplay.
'send message' becomes 'page' (to contact using a pager).
'to workers' becomes 'ants' (worker ants).
'page'+'ants'='PAGEANTS'
'making' acts as a link.
(Other definitions for pageants that I've seen before include "Elaborate processions or tableaux" , "Dramatic or spectacular tableaux" , "spectacles" , "Rich and spectacular ceremonies" , "Costumed processions" .)