They recommend, now, having face protectors (8)
I believe the answer is:
advisors
'they recommend' is the definition.
The definition suggests an adverb but the answer is not.
'now having face protectors' is the wordplay.
'now' becomes 'AD' (AD, Anno Domini, as opposed to BC, Before Christ).
'having' says to put letters next to each other.
'face protectors' becomes 'visors' (I can't explain this - if you can you should believe this answer much more).
'ad'+'visors'='ADVISORS'
Can you help me to learn more?
(Another definition for advisors that I've seen is " Those offering pupil advice".)