Find out Labour's beginning to work for money (5)
I believe the answer is:
learn
'find out' is the definition.
('learn' can be a synonym of 'find out')
'labour's beginning to work for money' is the wordplay.
'beginning to' suggests taking the first letters.
'work for money' becomes 'earn' (I've seen this before).
The first letter of 'labours' is 'l'.
'l'+'earn'='LEARN'
(Other definitions for learn that I've seen before include "Be educated" , "Comprehend" , "Gain knowledge or skills" , "Renal (anag)" , "what pupils do in schools" .)