Time for a jar with a bird (5)
I believe the answer is:
night
'bird' is the definition.
(night bird is a kind of bird)
'time for a jar' is the wordplay.
'time' becomes 't' (abbreviation).
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'a jar' becomes 'nigh' (I can't justify this - if you can you should believe this answer much more).
't' put after 'nigh' is 'NIGHT'.
'with a' is the link.
Can you help me to learn more?
(Other definitions for night that I've seen before include "End of the day" , "Period of darkness" , "Dark period" , "From dusk until dawn" , "Evening" .)