Time to celebrate Labour's help (6)
I believe the answer is:
mayday
'help' is the definition.
(I've seen this before)
'time to celebrate labour's' is the wordplay.
'time' becomes 'may' (I've seen this before).
'to celebrate labour's' becomes 'day' (I can't explain this - if you can you should give a lot more credence to this answer).
'may'+'day'='MAYDAY'
Can you help me to learn more?
(Other definitions for mayday that I've seen before include "Request for help" , "Help urgently needed" , "call for help?" , "please help" , "International radio distress signal" .)