Hi mooncow,
In 34ac, “man” is an extra word. The definition is “fruit”. The first word in the answer has 3 letters and is a word that can mean “bomb”. The second word is a well-known fruit that can also mean “stone embedded in concrete”.
23dn is thematic. The definition is “defeats (as a plural noun), and the wordplay leads to the standard abbreviation for “bishop”, a six-letter word that can mean “upsetting”, and the first letter of “stalemate”. You have to remove a two-letter thematic item to obtain the entry, which is defined by the extra word in 28ac.
I hope this helps.