It has around ten numbers and fourteen lines (6)
I believe the answer is:
sonnet
'fourteen lines' is the definition.
'sonnet' can be an answer for 'lines' (poem of 14 lines). I'm not certain of the 'fourteen' bit.
'it has around ten numbers' is the wordplay.
'it' becomes ''t' (abbreviation. e.g. in 'tis).
'has' is a charade indicator (letters next to each other).
'around' says the letters should be written in reverse.
'ten' becomes 'en' (I can't explain this - if you can you should believe this answer much more).
'numbers' becomes 'nos' ('no' is an abbreviation for number).
'en'+'nos'='ennos'
'ennos' backwards is 'sonne'.
't' put after 'sonne' is 'SONNET'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for sonnet that I've seen before include "Short poem with 14 lines" , "Sent on the verse form" , "Tonnes (anag.)" , "Poem of 14 lines - Shakespeare wrote lots" , "Form of poem" .)