Thanks for that - wish somebody had got me Chambers for Xmas!
Thought of Pons but adj listed (online) as pontine or pontile - still leaves resolution problem - should resolve to E but leaves me with another word I can't find(but which may be in Chambers- postie changing direction?)
I think a Chambers is essential for cryptic crosswords - I understand that most setters use them. But you need an older Collins for proper nouns - I read somewhere that the lastest edition doesn't give them.