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26a Is a term often used in card games and means to outdo or "knock spots off" - Front letter of "trousers" + a 4 letter word for "rear"

20d Is a type of neck wear (that one might use in a hurry) - It's a 3 letter word for "fleece" around a 3 letter word for "cheek"

5d Definition is someone "who talks twaddle" and is a 5 letter word for a "gas" surrounded by a 4 letter word for "mock"

Thanks brendan and elle - I hadn't checked the anagram in 11ac, so putting that right made 2dn clear at once, though I needed a nudge to remind me of Paul Simon's musical partner.
For 28ac, I should have looked at a map.