Essira - the clash in 1ac is with 2dn, 3 letters and 1 letter respectively with the 1 winning if you get my drift.
I rarely visit here until grid fully complete but have to say this is a beast, not helped by being in the wilds of Scotland with no hard copy reference material. At least the typical (ahem!) local weather has encouraged me to stay indoors and complete the task! ;¬)