Newspaper covers one aspect (5)
I believe the answer is:
facet
'aspect' is the definition.
(synonyms)
'newspaper covers one' is the wordplay.
'newspaper' becomes 'ft' (Financial Times newspaper).
'covers' indicates putting letters inside.
'one' becomes 'ace' (ace has a value of one in some card games).
'ft' placed around 'ace' is 'FACET'.
(Other definitions for facet that I've seen before include "(Gem) side; aspect" , "Smooth surface of a gem" , "Characteristic" , "Distinct feature" , "view" .)