True Right takes ale when drunk (4)
I believe the answer is:
real
'true' is the definition.
('real' can be a synonym of 'true')
'right takes ale when drunk' is the wordplay.
'right' becomes 'r' (common abbreviation**).
'takes' indicates putting letters inside (take can mean to capture or invade).
'when drunk' is an anagram indicator (I've seen this in other clues).
'ale' with letters rearranged gives 'eal'.
'r' inserted inside 'eal' is 'REAL'.
(Other definitions for real that I've seen before include "Unaffected" , "Existing, not imaginery" , "Genuine - old Spanish coin" , "foreign currency" , "Genuine, not imitation" .)