Tense worried comedian (4)
I believe the answer is:
tate
'comedian' is the definition.
(comedian Catherine Tate)
'tense worried' is the wordplay.
'tense' becomes 't' (abbreviation used in many dictionaries).
'worried' becomes 'ate' (something worrying may eat someone up).
't'+'ate'='TATE'
(Other definitions for tate that I've seen before include "Maurice - - , cricketer 1895-1956" , "art patron" , "- - Modern: art gallery" , "One of four art galleries in England" , "Gallery (or two!)" .)