19 across
Giant
Carmelites,
perhaps,
too
much
to
expect
(4,5)
Giant Carmelites, perhaps, too much to expect (4,5)
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The definition is at the end of the clue.
How the clue works
The definition is too much to expect, giving you a phrase meaning an unreasonable demand. Giant gets you TALL, and Carmelites, perhaps points to ORDER — they're a religious order, you see, so "perhaps" is doing the work of hinting at the category.