Maharishi possibly ascending at regular intervals in glory (4)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

Alternate letters (at regular intervals), reversed (ascending = upwards in a down clue), from I [n] G [l] O [r] Y . Yogi = someone who practices yoga, as in Hinduism and other traditions; maharishi = a revered Hindu teacher.