Judge old bottle capable of providing cheer (6)
I believe the answer is:
jovial
'capable of providing cheer' is the definition.
(jovial means jolly or light-hearted)
'judge old bottle' is the wordplay.
'judge' becomes 'j' (abbreviation for judge).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'bottle' becomes 'vial' (vial is a kind of bottle).
'j'+'o'+'vial'='JOVIAL'
(Other definitions for jovial that I've seen before include "Cheerful, friendly" , "Good-humoured, cheerful" , "Convivial" , "Genial, joyous" , "Full of cheerful good humour" .)