A hybrid throughout (6)

I believe the answer is:

across

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'throughout' is the definition.
Both the answer and definition are adverbs. Maybe they are linked in a way I don't understand?

'a hybrid' is the wordplay.
'hybrid' becomes 'cross' (I've seen this before).
'a'+'cross'='ACROSS'

Can you help me to learn more?

(Other definitions for across that I've seen before include "Towards the other side of" , "Facing" , "From one side to another" , "ax" , "Unlike this clue" .)

I've seen this clue in The Telegraph.

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