Managed to lose the paper and only just found it again. Help needed on a few,
34d Nearly buy Scottish property disused in Java(6 - C?????)
28d Regional expert leaving gratuitously heckles (7)
38a Hedge swamp without environmentally friendly backing (7 - ???X???)
PLEASE NOTE: with the last across clue, 'the wordplay refers to the grid entry, which is a jumble of the defined answer'(preamble)
Explanations would be gratefully accepted, and many thanks in advance.