Gdn Cryptic

[davidas]

Last but not least.

Gulf citizens infringe rights. (9)

R - M - N - S - S

Romanisms? No - can't see it.

Help appreciated.

[Lie-in King]

3d (themed) Romanists - 'Omanis' (infringe; get into) 'r(igh)ts'

[davidas]

Omanis - get that.

Rts for rights - get that.

What has Romanists to do with anything?

[Lie-in King]

Nothing at all, it's an undefined clue, as per the "Special Instructions"

[xxyyzz]

Instructions say: "...Five across and eight down solutions involve, wholly or in part, some of 5 down and lack any further definition"
In this case the isle involved is Man.

[dannyk13]

Romanists - omanis(Gulf citizens) inside rts(Rights)