His labours lead to a load of rubbish (7)
I believe the answer is:
dustman
'his labours lead' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'a load of rubbish' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is located in the answer.
'rubbish' could be 'dust' (dust is a kind of rubbish) and 'dust' is present in the answer.
A single letter 'm' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'to' is the link.
Can you help me to learn more?
(Other definitions for dustman that I've seen before include "My old man's occupation" , "Garbage collector" , "Bin emptier" , "I clear what's left" , "Refuse collector" .)