thanks for the clue, loge - I did have the wrong letter at 16, thinking it was the START of the blemish (not the end), so the def at 11 must be the first word, but it seems clumsy to have to add a letter and then take it out ...
And, yes, after all the controversy last month, it seems we were right to be confused.
15 squared has Adrian WILTSHIRE (actor)
Guardian annotation has Adrian DURHAM (journalist) and Victoria DERBYSHIRE (presenter)
Chandler (the setter himself) says it's
Adrian DURHAM (presenter)
Victoria DERBYSHIRE (journalist) and
Joey ESSSEX (actor)
This was the conclusion I finally came to - though Chandler admits the Essex description is poor and inappropriate.