Byron's laugh, thought to embody ‘offensive (9)

I believe the answer is:

onslaught

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

''offensive' is the definition.
(I've seen this before)

'byron's laugh thought to embody' is the wordplay.
'ONSLAUGHT' is hidden in amongst the letters.
However, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for onslaught that I've seen before include "Barrage" , "Violent attack" , "offensive action" , "Fierce attack" , "Vicious attack" .)

I've seen this clue in The Guardian.

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