Worry (5)
'worry' is the definition.
(angst means worry or dread)
This is all the clue.
(Other definitions for angst that I've seen before include "Nonspecific sense of anxiety" , "Anguish" , "Anxiety, guilty feeling" , "Painful feeling" , "Great anxiety" .)
'worry' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for alarm that I've seen before include "Security device" , "Noise giving warning" , "Arouse to a sense of danger" , "Consternation: kind of clock" , "Device signalling danger" .)
'worry' is the definition.
(I know that brood is a more specific form of the action the worry)
This is the entire clue.
(Other definitions for brood that I've seen before include "Sulk; incubate" , "Family of young birds" , "Ponder - family" , "Think resentfully - about young birds?" , "Meditate, fret" .)
'worry' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for harry that I've seen before include "Prince William's younger brother" , "Torment by constant attack" , "Hassle" , "Enfield, perhaps" , "English prince - trouble" .)
'worry' is the definition.
(to fret about something is to worry)
This is all the clue.
(Other definitions for fret that I've seen before include "Sort of saw work" , "Chafe; worry" , "Distress oneself" , "Wear away" , "Fog" .)
'worry' is the definition.
(I know that worry can be written as concern)
This is all the clue.
(Other definitions for concern that I've seen before include "Have something to do with" , "Business organisation" , "Relate to; anxiety" , "Disquiet" , "Affair" .)
'worry' is the definition.
(to perturb is to worry or unsettle someone)
This is all the clue.
(Other definitions for perturb that I've seen before include "Bother" , "Disturb - trouble" , "Unsettle; PR brute (anag.)" , "Disturb the composure of" , "Worry" .)