Worried, not getting a hi-tech acknowledgement (6)
I believe the answer is:
credit
'acknowledgement' is the definition.
(acknowledgement of a contribution)
'worried not getting a hi-tech' is the wordplay.
'worried' becomes 'cared'.
'not getting' indicates named letters should be taken away.
'hi-tech' becomes 'IT' (Information Technology).
'cared' with 'a' taken out is 'cred'.
'cred'+'it'='CREDIT'
(Other definitions for credit that I've seen before include "Money available for borrowing" , "(Account) sum received" , "Time to pay, or due recognition" , "Positive balance in account" , "Direct (anag) - tick" .)