Feel anxious, hampering style (4)
I believe the answer is:
elan
'style' is the definition.
(synonyms)
'feel anxious hampering' is the wordplay.
'hampering' says the answer is hidden in the clue (hamper can mean to obstruct or curb).
'ELAN' is hidden in the letters of 'feel anxious'.
(Other definitions for elan that I've seen before include "Flair and dash" , "Vigour, panache" , "Dash in French lane" , "Stylishness" , "Vigour, style, enthusiasm" .)