One out on the tiles may see the end of celebrations in due course (6)
I believe the answer is:
slater
'one out on the tiles' is the definition.
(person working on roof tiles)
'the end of celebrations in due course' is the wordplay.
'the end of' suggests the final letters.
'in due course' becomes 'later' (I've seen this before).
The last letter of 'celebrations' is 's'.
's'+'later'='SLATER'
'may see' acts as a link.
(Other definitions for slater that I've seen before include "High-reaching worker perhaps" , "Craftsman" , "Alerts (anag) - building worker" , "Layer of roof slabs" , "Does one abuse" .)