Crossword Genius

Key rings prohibited (5)

Ross

I believe the answer is:

taboo

'prohibited' is the definition.
(I know that prohibited can be written as taboo)

'key rings' is the wordplay.
'key' becomes 'tab' (key on a computer keyboard).
'rings' becomes 'oo' (multiple circles).
'tab'+'oo'='TABOO'

(Other definitions for taboo that I've seen before include "Ritual prohibition" , "Forbidden by social custom" , "Not to be mentioned" , "A ban or prohibition of superstitious kind" , "unacceptable" .)

I've seen this clue in The Sun.
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