Bright red tailless bird (7)
I believe the answer is:
flaming
'bright red' is the definition.
'flaming' can be an answer for 'red' (thesaurus). I am unsure of the 'bright' bit.
'tailless bird' is the wordplay.
'tailless' means to remove the last letter (the tail of the word is removed).
'bird' becomes 'flamingo' (flamingo is a kind of bird).
'flamingo' with its final letter taken off is 'FLAMING'.
Can you help me to learn more?
(Other definitions for flaming that I've seen before include "Burning fiercely" , "Passionate" , "Fiery" , "Brightly coloured" , "Ardent" .)