Third Division bottom club Clyde moved to within a point of East Stirlingshire and Annan Athletic with victory against Peterhead.
After a goalless first half, Kevin Watt headed home Pat Scullion's cross to give the hosts the lead on 65 minutes.
And promotion-chasing Peterhead's afternoon went from bad to worse when Ryan Strachan fouled Kieran McGachie in the penalty area and was promptly sent off.
John Sweeney confidently converted the resulting spot-kick six minutes from the end.
Barclay, Scullion, Lyden, Gray, McDonald, Nicoll (Fitzpatrick 85), Sweeney, Hay, McColm, Watt (Fitzharris 69), McCluskey (McGachie 78). Subs Not Used: Rajovic, John Kane.
Watt 65, Sweeney 84 pen.
Graeme Smith, McGlinchey, Ross Smith, Strachan, Noble, Cox, Redman (Sharp 70), Cowie (McCann 78), Gilfillan (Rodgers 70), McAllister, McLaughlin. Subs Not Used: Jarvie, Tully.