Love to gather together by word of mouth (6)
I believe the answer is:
orally
'by word of mouth' is the definition.
(I've seen this before)
'love to gather together' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'to' says to put letters next to each other.
'gather together' becomes 'rally' (rallying is a kind of gathering. I am not sure about the 'together' bit.).
'o'+'rally'='ORALLY'
Can you help me to learn more?
(Other definitions for orally that I've seen before include "By spoken word" , "How one speaks" , "How anyone would speak" , "as auditions are done" , "By (word of) mouth" .)