Try a leg in a big way (7)

I believe the answer is:

greatly

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

'in a big way' is the definition.
(I've seen this in another clue)

'try a leg' is the wordplay.
'try a leg' can be anagrammed to 'GREATLY'.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for greatly that I've seen before include "To a large extent" , "to a considerable extent" , "Very much" .)

I've seen this clue in The Irish Independent.

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