Birds caught with trouble are located among larks (13)
I believe the answer is:
capercaillies
'birds' is the definition.
(capercaillie is a kind of bird)
'with trouble are located among larks' is the wordplay.
'with' is an insertion indicator.
'trouble' becomes 'ail' (synonyms).
'are located' becomes 'clie' (I can't explain this - if you can you should give a lot more credence to this answer).
'among' indicates putting letters inside (inserted letters are placed among others).
'larks' becomes 'capers' (lark can mean a caper or bit of fun).
'ail' inserted into 'clie' is 'caillie'.
'caillie' inserted into 'capers' is 'CAPERCAILLIES'.
'caught' acts as a link.
This may not be right. It may belong to another bit of the clue.
Can you help me to learn more?
(Another definition for capercaillies that I've seen is " Grouse".)