Sang out when in difficulty (4)

I believe the answer is:

snag

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'in difficulty' is the definition.
'snag' can be an answer for 'difficulty' (snag is a kind of difficulty). I'm not sure about the 'in' bit.

'sang out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'sang' anagrammed gives 'SNAG'.

'when' acts as a link.

Can you help me to learn more?

(Other definitions for snag that I've seen before include "Minor difficulty" , "Tear - catch" , "Hidden obstacle or drawback" , "banger down under" , "Problem or drawback" .)

I've seen this clue in The Globe and Mail.

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