Laze around with gusto! (4)
I believe the answer is:
zeal
'gusto' is the definition.
(I've seen this in another clue)
'laze around' is the wordplay.
'around' indicates an anagram.
'laze' anagrammed gives 'ZEAL'.
'with' acts as a link.
(Other definitions for zeal that I've seen before include "Intense enthusiasm" , "Prompt willingness" , "Passion" , "Dedicated enthusiasm" , "Fervent devotion" .)