I don't worry about Leonard being lazy (8)
I believe the answer is:
indolent
'lazy' is the definition.
(synonyms)
'i don't worry about leonard' is the wordplay.
'worry' indicates an anagram.
'about' indicates putting letters inside.
'leonard' becomes 'len' (I've seen this in other clues).
'dont' is an anagram of 'ndot'.
'ndot' placed around 'len' is 'ndolent'.
'i'+'ndolent'='INDOLENT'
'being' is the link.
(Other definitions for indolent that I've seen before include "Lazy, slothful" , "Disinclined to exertion or work" , "Disinclined to exert oneself" , "Making no effort" , "Work-shy" .)