Skill shown by journalists drinking old whiskey (7)
I believe the answer is:
prowess
'skill' is the definition.
(I've seen this before)
'journalists drinking old whiskey' is the wordplay.
'journalists' becomes 'press' (the press can mean the newspaper industry).
'drinking' indicates putting letters inside (inserted letters are consumed or drunk).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'whiskey' becomes 'W' (phonetic alphabet: alpha, bravo, charlie etc.).
'o'+'w'='ow'
'press' enclosing 'ow' is 'PROWESS'.
'shown by' acts as a link.
(Other definitions for prowess that I've seen before include "Ability, expertise" , "Outstanding skill" , "Mastery - talent" , "Skill, expertise; bravery" , "Great ability or daring" .)