A large branch gets a wake-up call (5)

I believe the answer is:

alarm

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'call' is the definition.
(thesaurus)

'a large branch' is the wordplay.
'large' becomes 'l'.
'branch' becomes 'arm' (synonyms).
'a'+'l'+'arm'='ALARM'

'gets a wake-up' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for alarm that I've seen before include "Noise that wakes" , "Warning sound or signal" , "Distress signal" , "Device signalling danger" , "Device sounding danger" .)

I've seen this clue in The Guardian.

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