In post-revolution China stumped by boastful talk done in desperation (8)

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

In post-revolution China, stumped by boastful talk done in desperation [ST (=stumped, on cricket scorecard) + GAS (=boastful talk)] in LAP (PAL=China, in rhyming slang; “post-revolution” indicates vertical reversal); a last-gasp attempt is made in desperation