CCCWC March competition voters’ comments on Clue no. 42

A clue to A “GMT” word (Letters Latent).
3 comments refer to this clue (from 3 competitors, 0 others)

Here is the text

Comments on the clue

1.	"AB" could be better clued
2.	Lovely surface but "used by", or at least "by", seems like filler.
3.	English openers for AB seems very dodgy to me – presumably this is supposed to mean first two letters in alphabet