Banned cricketer over his fruitless efforts in match? (5)
I believe the answer is:
Here is my best explanation:
This might be a double definition.
'banned' is the first definition.
(I've seen this before)
'cricketer over his fruitless efforts in match?' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
(Other definitions for taboo that I've seen before include "Prohibited by social custom", "Ban", "Not to be mentioned", "Not allowed, forbidden, proscribed", "Inhibition based on social custom", "A ban or prohibition of superstitious kind", "(Something) forbidden", "unacceptable", "No-no" and "By religion or custom, not to be done or touched".)