David McDaid's late header gave Cliftonville interim boss Gerard Lyttle a winning start as the Reds edged out 10-man Glentoran at Solitude.
The Reds were rocked by Tommy Breslin's resignation earlier this week but they had the better of a low-key first half.
Glens defender Marcus Kane was dismissed for two yellows on 70 minutes and Cliftonville piled on the pressure.
McDaid netted from Eamon Seydak's cross after 82 minutes to keep the Reds five points behind leaders Linfield.
There were few chances in a frantic opening 45 minutes although it required a good save from Cliftonville keeper Conor Devlin to keep out Steven Gordon's effort.
The Reds also went close with Stephen Garrett's volley bringing out another fine save, this time from Aaron Hogg.
Devlin again came to Cliftonville's rescue in the second half with a terrific double-save from Conor McMemamin strikes.
The game turned on Kane's departure after he bundled over Martin Murray and the Glens defended stoutly until McDaid made the breakthrough.
The former Derry City and Coleraine forward met Seydak's pinpoint cross at the backpost and his downward header hit the Glens net.
Cliftonville stay third although they have closed to within a point of north Belfast rivals Crusaders, while Glentoran have slipped two places to eighth.