Hi everyone
I too was dismayed to find brendan et al had found this puzzle easy.  Like femmenoire, I've found it very difficult.
I started after lunch as usual, and solved a couple, then remembered I needed to prune another shrub whilst it was sunny, though not exactly warm.  Having dealt with the Grisselini, I started again after 4.00pm.  Since then it has been slow going and I can't parse some of the clues.  I've done about halve, but am stuck on the rest despite your various clues.  Like Danf,  I don't think I know the gold coin for 11ac, so a further clue would be helpful.    I'm assuming this is the name of a famous instrumentalist. 
 A help for 3d would also be gratefullyl received.  I have C?N???L?.  I understand the definition is a large number of churchgoers, but fear I might not know the word.
I have an answer for 26, but have never heard of this "coupist".  I thought I knew the beginning of 12d, but can't find a word.  I have ??P???T?E?? 
I look forward to hearing from one of you/