4 down (4) R??? Run on the bank, that`s growing. Rush? 8 across (4)(3) ??O? O?F Don`t go on, to break one`s journey. Stop off? 21 across (6) G?S?E? Mark`s kind of music.
Many thanks, tyrepill and scorpiojo. It seems I had two of the answers but they just didn`t seem quite convincing so your confirmation provided the necessary reassurance.