Got it! And I'll be in trouble for forgetting it because it's on one of the South Roscommon Singers Circle CD's ("Alone by the Wild Wood", available at www.dhalonproductions.ie ), sung by my good friend Johnny Johnston). The accompanying booklet by the inimitable Declan Coyne gives the lyrics in full (seven stanzas) and an account of the background. I'll transcribe it over the next few days.

Regards
p.s. In fact, as I read the notes, I realise that its also on another of the South Roscommon CD's! No wonder it sounded familiar...