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Need some help with this....

Space pioneer a jolly good fellow or, on reflection, no good (9) ARMSTRONG would fit the def. with A ST (good fellow) + OR + No Good but where does the RM come from?

jolly is a term for (R)oyal (M)arine

RM royal marine, known as a jolly.

http://www.modern-day-commando.com/Royal-Marines.html

Excellent, thanks guys.