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 give a lot more credence to this answer).
'about' is an insertion indicator.
'a bad' indicates anagramming the letters.
'loss' is an anagram of 'ossl'.
'cry' placed 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" .)