Cryptic in Telegraph I'd denigrated (6)
I believe the answer is:
hidden
'cryptic' is the definition.
(thesaurus)
'in telegraph i'd denigrated' is the wordplay.
'in' indicates a hidden word.
'HIDDEN' is hidden in the letters of 'telegraph id denigrated'.
(Other definitions for hidden that I've seen before include "Concealed, having been put away secretly" , "Consealed or secret" , "Latent" , "behind closed doors" , "Obscure" .)