Diehard has to laze around (6)
I believe the answer is:
zealot
'diehard' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'to laze around' is the wordplay.
'around' indicates anagramming the letters.
'to'+'laze'='tolaze'
'tolaze' is an anagram of 'ZEALOT'.
'has' acts as a link.
Can you help me to learn more?
(Other definitions for zealot that I've seen before include "Over-zealous person, fanatic" , "Fanatic person, much too enthusiastic" , "Fervent, perhaps militant, proponent" , "One ardent for cause" , "A fanatic, driven person" .)