Worried parent becomes fascinated (6)
I believe the answer is:
enrapt
'fascinated' is the definition.
(I've seen this before)
'worried parent' is the wordplay.
'worried' is an anagram indicator (worry can mean to interfere with or disturb).
'parent' is an anagram of 'ENRAPT'.
'becomes' is the link.
(Other definitions for enrapt that I've seen before include "Turned on" , "state of ecstasy" , "Fascinated" , "Sent" , "Deeply absorbed in something" .)