Worry as section in Tweed is turbulent (7)
I believe the answer is:
disturb
'worry' is the definition.
(I know that worry is a is a more specific form of the action cark)
'section in tweed is turbulent' is the wordplay.
'section' indicates a hidden word.
'DISTURB' is hidden within 'in tweed is turbulent'.
'as' acts as a link.
(Other definitions for disturb that I've seen before include "Bother" , "Molest" , "Upset, confuse" , "Interrupt (sleep)" , "startle" .)