Angrily cry out about a bad loss (7)
I believe the answer is:
crossly
'angrily' is the definition.
(I've seen this before)
'out about a bad loss' is the wordplay.
'out' becomes 'cry' (I can't justify this - if you can you should believe this answer much more).
'about' means one lot of letters goes inside another.
'a bad' indicates anagramming the letters.
'loss' anagrammed gives 'ossl'.
'cry' going around 'ossl' is 'CROSSLY'.
'cry' is the link.
This may not be right. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for crossly that I've seen before include "Angrily" , "in anger" .)