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4d, 2words, Off ?I?t?r, Lopsided skirt - present to wrap.
13a, ?u?l, Being red in 16, it's surrounded by 25.
20d, R?s?i, Potato dish that prostitute's eaten.
24d , R?b, Polish river, centre of republic.

Off Kilter

Bull?

Rosti

Rub

4 Off Kilter (Offer, with Kilt/skirt inside)

4d off kilter

20d rosti hidden in pROSTitute
24d R(river) + ub (centre of republic)

Thanks mamya, Malone and bunty for help, now finished it.