Agitated perhaps in one's fears (13)
I believe the answer is:
apprehensions
'fears' is the definition.
(apprehension is a kind of fear)
'agitated perhaps in one's' is the wordplay.
'agitated' is an anagram indicator.
'perhaps'+'in'+'ones'='perhapsinones'
'perhapsinones' is an anagram of 'APPREHENSIONS'.
I've seen this clue in The Times.
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