Can Someone Help With Clues From Everyman Crossword 6Th September

[Magicmeg]

Can anyone help with the following?
4D Change technique, climbing with son for miles in country (14)
14A Demanding push to create space for emergency stops (4,8)
1D Elastic cut during second attempt (8) Think this may be stretchy?

Thanks

[Lie-in King]

4d Transformation - 'art' (technique, up) + 's(on) for m(iles)' (in) 'nation'
14a Hard shoulder
1d Stretchy - 'etch' (cut, in) 's(econd) try'

[scorpiojo]

Transformation - art reversed + nation + s(on) for m(iles)
Hard shoulder
S tr etch y

[Magicmeg]

Thanks, Lie in king and Scorpiojo.
I have struggled on with this new setter for weeks now and still find some of the clues impossible.