Kind of labour we get fed up about (7)
I believe the answer is:
sweated
'kind of labour' is the definition.
The answer and definition are different parts of speech. However, adjectives and past participle verbs can occasionally mean the same thing.
'we get fed up about' is the wordplay.
'get fed up' becomes 'sated' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'about' indicates putting letters inside.
'we' going within 'sated' is 'SWEATED'.
Can you help me to learn more?
(Other definitions for sweated that I've seen before include "(Of labour) ill treated and ill paid" , "Reacted to heat; exploited (labour)" .)