Speak about quote (6)
I believe the answer is:
recite
'speak' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their base form.
Maybe they are linked in a way I don't understand?
'about quote' is the wordplay.
'about' becomes 're' (common abbreviation for 'with reference to').
'quote' becomes 'cite' (synonyms).
're'+'cite'='RECITE'
Can you help me to learn more?
(Other definitions for recite that I've seen before include "Repeatr aloud from memory" , "Reel off" , "Speak (poem) aloud" , "Repeat, recount" , "Render verbally" .)