Badly hit gym? Definitely! (6)

I believe the answer is:

mighty

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

'definitely' is the definition.
Both the answer and definition are adverbs. Maybe there's a link between them I don't understand?

'badly hit gym?' is the wordplay.
'badly' indicates anagramming the letters.
'hit'+'gym'='hitgym'
'hitgym' anagrammed gives 'MIGHTY'.

Can you help me to learn more?

(Other definitions for mighty that I've seen before include "Powerful - huge" , "Extremely" , "Large" , "Having great strength" , "Arrogant people are often described as high and . . . . . ." .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.