Bad Mailer novel deserving respect (9)
I believe the answer is:
admirable
'deserving respect' is the definition.
(I've seen this before)
'bad mailer novel' is the wordplay.
'novel' is an anagram indicator (letters in a new or novel order).
'bad'+'mailer'='badmailer'
'badmailer' with letters rearranged gives 'ADMIRABLE'.
(Other definitions for admirable that I've seen before include "Commendable" , "Outstanding" , "Worthy of being held in high opinion" , "Deserving of praise" , "Praiseworthy" .)