Saoralba is absolutely correct about the definition in 19a, which is plain wrong. I'm surprised it wasn't spotted by the editors, who are usually meticulous about this sort of thing. I think 'left' for reversal is acceptable since the adverbial definition is 'towards the left'.
I couldn't see the point of 'struggling' in 1d. There's nothing in the Chambers definition to support it. There was also an ambiguity in the extra letter since either 'love' or 'over' gives the deduction of O. Trust me to have the wrong one to begin with.
My last niggle is 37a., which could have been an easily recognised AUDI rather than a name that meant absolutely nothing at all to me.
Apart from those complaints I thought the clues were very good.