Good morning dizoz - you were up early! Not done much myself yet, hoping to have a good crack at it today.
27a defn is family eating place, for the wordplay you need to lose 1 letter
26a defn is cure, same as above for wordplay
17a defn is brown sugar, same again
Sometimes the same letter is "omitted" twice e.g. 1d.
I've done a few more - my method is to hunt out the defn, get an answer for it and try to relate it to the wordplay!