Caught fierce Siberian beast in its habitat? (5)

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

Oral wordplay [caught] TAIGA (its habitat)  / “tiger” (fierce Siberian beast). Taiga is the swampy coniferous forest of high northern latitudes, especially that between the tundra and steppes of Siberia. I didn’t know that tigers live there but they do, sometimes referred to as the Siberian tiger, or more commonly, the Amur tiger. The definition refers back.