Manu, I thought 14a was hidden in the clue, with definition “by the road”. Hence I reasoned Y mapped to K.
In 23d, aside from being the name of the explorer, the two-word phrase is often used in Stella Gibbons’ Cold Comfort Farm. As in “I mun go into town this morning”. Country indicates it’s dialectical.
I thought 5d was just a charade for how one might say a second in speech.
I wasn’t totally convinced by 28a, though I assumed the answer related to guns