6a Terrible excursion around island with a decorator's assistant (5,8).
Looks like 'paint stripper', but I can't parse it (except for seeing the 'trip' which might have something to do with the 'excursion' in the clue).
50d Readily available patent number withdrawn (2,3)
On tap?
Yes, a number of obscurities but mostly possible to get from wordplay and it didn't feel like a general knowledge quiz. For me a fair enough puzzle on the easier end of the spectrum.
Hi MadWoman, having just taken ages to get one answer because you need to know that ‘wat’ is a Thai or Lao word for a temple I definitely agree that this had too many obscurities.