A bull never badly at risk (10)
I believe the answer is:
vulnerable
'at risk' is the definition.
(something at risk is vulnerable or in danger)
'a bull never badly' is the wordplay.
'badly' indicates an anagram.
'a'+'bull'+'never'='abullnever'
'abullnever' is an anagram of 'VULNERABLE'.
(Other definitions for vulnerable that I've seen before include "Susceptible" , "Exposed" .)
I've seen this clue in The Times.
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