rt46

[j4277]

last one - 1d guard fails to open doorway (5) - *N*R* - ???

[bibblebub]

(s)ENTRY

[shooty]

(s)entry

[j4277]

Thank you, but that doesn't fit with 6a as 'unlocking' (anagram of gin no luck), whicxh gives 'n' as second letter...so can't be sentry!

[shooty]

With all respect, can we ask for the clue to 6d ?

[bibblebub]

ENTRY - remove the leading letter (i.e. fails to open) from 'sentry'

[shooty]

sorry. the answer is ENTRY with the 'S' taken away

[j4277]

Now it makes sense! Thank you all, I can sleep tonight now!

[bibblebub]

It's been a convention on AB for some time to indicate letters to be removed/ignored by enclosing them in parentheses but, perhaps, that intention is not immediately obvious so apologies for any confusion.