Infatuated old queen entertaining second journalist (8)
I believe the answer is:
obsessed
'infatuated' is the definition.
(thesaurus)
'old queen entertaining second journalist' is the wordplay.
'old' becomes 'o' (abbreviation).
'queen' becomes 'bess' (nickname for Elizabeth I).
'entertaining' is an insertion indicator (inviting in, as for dinner).
'second' becomes 's' (common abbreviation).
'journalist' becomes 'ed' (short for editor).
'bess' going around 's' is 'bsess'.
'o'+'bsess'+'ed'='OBSESSED'
(Other definitions for obsessed that I've seen before include "Being excessively concerned with something" , "Compulsively concerned with something" , "Fanatical" , "With compulsion" , "Hung up" .)