Hi RossR.
The clue was "Hebrew reading's a bit of a gimmick, right?", and the answer is k'ri, or kri, which is a marginal reading in the Hebrew Bible. It's hidden in the last two words of the clue.
As I recall the second letter was one of the five clashes in the grid, and you needed to enter an O to give KOI intersecting with ECTODERM. The R which was thus discarded was the third letter of the thematic item of clothing.