Without duties or reward, neither coming between the old and grizzled (8)
I believe the answer is:
honorary
'without duties or reward neither' is the definition.
I can't tell whether this defines the answer.
'coming between the old and grizzled' is the wordplay.
'coming between' is an insertion indicator.
'the old' becomes 'hoary' (I've seen this before).
'and' becomes 'n' (common abbreviation for 'and').
'grizzled' becomes 'or' (I can't explain this - if you can you should believe this answer much more).
'n'+'or'='nor'
'hoary' going around 'nor' is 'HONORARY'.
Can you help me to learn more?
(Other definitions for honorary that I've seen before include "Unpaid position or unearned degree" , "In name only" , "(Of title or office) not requiring one to perform services" , "Nominal" , "producing no income" .)