A few to finish and some explanations please if anyone is about at this late hour:
4d Rubbish offensive boxing in Ali's believer (6) Shiite?
17a Declare old cattle move to and fro with leaving (4) aver?
26d Persian expert sister dumped, impudent sort (4) ?ER?
31a Opening where bronze finally is put in (4) G??? Could it be gate?
Thank you for any help
4d Shiite (a follower of Ali) is correct. 'i' (abbreviation for 'in') in an offensive word for rubbish which this s*ite almost certainly will not allow one to type in uncensored form.
17a is AVER - double meaning (= declare and an old word for possessions such as cattle, confirmed by Chambers). 'Waver' (move to and fro), with 'w' (for 'with') leaving.