Swallow, I say jokingly (6)
I believe the answer is:
ingest
'swallow i' is the definition.
'ingest' can be an answer for 'swallow' (I've seen this before). I am not certain of the 'i' bit.
'say jokingly' is the wordplay.
'say' shows a homophone (sound like).
'jokingly' becomes 'in jest' (I've seen this in another clue).
'injest' sounds like 'INGEST'.
Can you help me to learn more?
(Other definitions for ingest that I've seen before include "Scoff" , "Absorb, assimilate" , "Take (food) into the body" , "Gets in (anag.)" , "Swallow -signet (anag)" .)