Chicken so attired probably not headless? (5)
I believe the answer is:
capon
'chicken' is the definition.
(I know that capon is a type of chicken)
'attired probably not headless?' is the wordplay.
'attired probably' becomes 'capo' (I can't justify this - if you can you should give a lot more credence to this answer).
'not' becomes 'un' (prefix meaning 'not').
'headless?' means to remove the first letter (I've seen 'headless' mean this).
'un' with its first letter taken away is 'n'.
'capo'+'n'='CAPON'
'so' is the link.
Can you help me to learn more?
(Other definitions for capon that I've seen before include "Castrated rooster fattened for eating" , "for lunch, perhaps" , "one fattened specially" , "poultry?" , "Male chicken for eating" .)