Crossword Genius

Roar when left under bridge (6)

Ross

I believe the answer is:

bellow

I'm a little stuck... Click here to teach me more about this clue!

'roar' is the definition.
(I know that roar can be written as bellow)

'left under bridge' is the wordplay.
I cannot quite see how this works, but
'left' could be 'l' (common abbreviation) and 'l' is found within the answer.
'under' could be 'below' (synonyms) and 'below' is located in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...

'when' is the link.

Can you help me to learn more?

(Other definitions for bellow that I've seen before include "Shout; Saul --, novelist" , "Yell" , "Loud deep sound as by bull" , "Loud and deep roar" , "Roar, shout" .)

I've seen this clue in the Sydney Morning Herald.
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