CCCWC March competition voters’ comments on Clue no. 20

A clue to TRUMPETER.
3 comments refer to this clue (from 3 competitors, 0 others)

Here is the text

Comments on the clue

1.	Still can't work it out – at best all the adding and subtracting is far too fiddly and not properly signposted
2.	Not sure about 'labour' as anagram indicator or its position in the wordplay. Its definition is 'work out in detail', otherwise very clever.
3.	Great surface.