Strong, lithe cat jumping about (8)

I believe the answer is:

athletic

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

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

'lithe cat jumping about' is the wordplay.
'lithe cat' can be anagrammed to 'ATHLETIC'.
Though, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for athletic that I've seen before include "Lithe act (anag)" , "Strong and vigorous" , "Active and fit for sport etc" , "See 12" , "Good at physical games" .)

I've seen this clue in The Times.

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