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21 across: Heath alongside grass I changed again. (2-6)
Have: A? E???E?
42 down: Hole’s opening in pierced plastic, producing crack (8)
Have: ?E?I?H?R
Feel the answer is decipher—crack a code. But unable to parse it, so maybe I’m wrong.

Assistance will be greatly appreciated.

Enigma

anagram of h + pierced gives your decipher

21 is RE EDITED
Heath is TED (Prime Minister) and grass is REED

DECIPHER _ anagram of PIERCED and H(ole's) opening

Thanks sudokulover.

And bracken dale—I'd misspelt 6 down!

Enigma