Assistant wants line put into a flirtatious note (7)
I believe the answer is:
acolyte
'assistant' is the definition.
(acolyte is a kind of assistant)
'wants line put into a flirtatious note' is the wordplay.
'wants line' becomes 'l' (I can't justify this - if you can you should give a lot more credence to this answer).
'put into' indicates putting letters inside.
'flirtatious' becomes 'coy' (I've seen this in another clue).
'note' becomes 'te' (musical note).
'a'+'coy'='acoy'
'l' inserted within 'acoy' is 'acoly'.
'acoly'+'te'='ACOLYTE'
Can you help me to learn more?
(Other definitions for acolyte that I've seen before include "Priest's attendant" , "Person who assists a priest" , "Lace toy (anag.)" , "Supporter" , "Priest's assistant at a liturgical service" .)