In hole, lift up little bird (6)
I believe the answer is:
peewit
'bird' is the definition.
(peewit is a kind of bird)
'in hole lift up little' is the wordplay.
'in' indicates putting letters inside.
'hole lift' becomes 'pit' (I am not sure about this - if you are sure you should believe this answer much more).
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'little' becomes 'wee' (similar in meaning).
'wee' back-to-front is 'eew'.
'pit' going around 'eew' is 'PEEWIT'.
Can you help me to learn more?
(Other definitions for peewit that I've seen before include "Does it weep, this bird?" , "Kind of plover; let it weep" , "Lapwing turned up in a wee pit" , "Flighty type" , "Northern lapwing" .)