Enjoyed this but found it a lot harder than last week. Some of the definitions seemed a bit iffy to me. Eg 26a, I think 'disposed of' is a misdirection too far! Who would ever say that in the context of the answer?! Not sure about 20a either - seems a bit loose to me, for both definitions.
Also, would not have got 3 down if I hadn't been on the lookout for the rhyming pair. Had no idea of either the definition or the parsing (thanks to others for that, and, I think, to Jono for explaining the 'group of three'). I still don't really get the definition though!
Needed anagram solver to get 24a.
14d was a case of biffing first and parsing afterwards, but it was a fair clue.
Enjoyed 25 and 17a, but I think 4d was my COD, which was also my LOI.