Shock - divas to underwhelm in part (7)

I believe the answer is:

astound

'shock' is the definition.
(thesaurus)

'divas to underwhelm in part' is the wordplay.
'in part' indicates a hidden word.
'ASTOUND' is hidden within 'divas to underwhelm'.

(Other definitions for astound that I've seen before include "Shock, surprise greatly" , "Stupefy" , "floor" , "Startle" , "Amaze, astonish" .)

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app