Hi, uncle_w,
You are nearly there with 5dn. The kitchen utensil is a PAN, with an added L to give PLAN. The wordplay leads to a reversal of NAP, a tip given to someone who bets on horses, etc.
You have the correct entry for 30dn. The T is the added letter here. EAS are a dialect word for water channels (singular is EA), and the wordplay leads to EAS(E).